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I have a rear discharge yardman mower with two blades and I've stupidly stripped the thread trying to remove one of the blades. I now need to buy a replacement spindle assembly and I've found the relevant assembly drawing of the deck:
http://www.yardmanspares.co.uk/yard-man-lawn-tractors/hn-5220-k/13bf514n643-2008/mtd010033
The two spindle assemblies are there, one is labelled 1 and the parts list gives the part number as 918-04657A ... the other is labelled 2 but there is no reference in the parts list.
I'm assuming that one must be right hand thread and the other left hand thread ... but how do I know which is which so I can order the correct one? Any help appreciated.

That link looks like they don’t sell the spindle. “1” refers to the spindle pulley. “2” refers to the spindle not available there.

Wrong, #1 is a full spindle assembly with pulley and is available. #2 is just a spindle assembly which is no longer available. You need to buy number 1, but do a google search with this number, 91804657A no dash and you should find it cheaper.

Rivets said:

Wrong, #1 is a full spindle assembly with pulley and is available. #2 is just a spindle assembly which is no longer available. You need to buy number 1, but do a google search with this number, 91804657A no dash and you should find it cheaper.

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Thanks for that ... there are plenty of places selling that assembly but I still don't know if I'm going to get a right hand thread or left hand thread. If the two blades turn in opposite direction, doesn't that mean the threads for the blades will be different?

My bad on the pulley. You would think they would be different threaded spindles though like you say.

Most times you are correct. Which spindle did you ruin, sitting on the seat, right or left spindle? Does the one you ruined have right or left hand blade bolt threads? Can you provide us with the units model and serial numbers? I understand you problem, but need a better picture in my mind how to answer.

Spindles that rotate counter clockwise , which should be the right hand spindle on your deck usually have a left hand thread so it self tightens in use
The pulley retainers are generally std right hand threads.

Rivets said:

Which spindle did you ruin, sitting on the seat, right or left spindle? Does the one you ruined have right or left hand blade bolt threads? Can you provide us with the units model and serial numbers? I understand you problem, but need a better picture in my mind how to answer.

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I can't remember which one because it was last year and the deck was off the mower. It was my ignorance of screw threads that made me strip it but I did nothing about it until now. It's a Yardman HN 5220 K, MTD 13BF514N643 (2008) ... some progress has been made in that I've found reference to two spindle assemblies, 618-04657 and 618-0609B. The French supplier I use has both but tech details don't mention right or left screw threads. Thanks to all who have answered so far.

If you look at the two spindle assemblies you posted, the 618-0609B assembly has a longer spindle shaft than the 618-04657 assembly. If I am looking at the drawings correctly the right spindle assembly (when you are looking at the rear discharge chute) is 618-04657 and the left spindle assembly is 618-0609B. If you just ruined the spindle shaft you can purchase it separately, but then I would also replace the bearings. Hope this helps.

According to the parts break down both the left & right spindles use the same nut to retain the blades, 712-05134 which is 5/8 UNC, RH thread.
I will try to find a deck breakdown on a USA web site to see if the part numbers are the same.
Would not be the first time in history that an IPL has been wrong.
And it is the same nut used on the top to secure the pulley

Rivets said:

If you look at the two spindle assemblies you posted, the 618-0609B assembly has a longer spindle shaft than the 618-04657 assembly. If I am looking at the drawings correctly the right spindle assembly (when you are looking at the rear discharge chute) is 618-04657 and the left spindle assembly is 618-0609B. If you just ruined the spindle shaft you can purchase it separately, but then I would also replace the bearings. Hope this helps.

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Perfect! Thank you very much for your help in pointing me in the right direction.

If I’m reading the different diagrams I see that the blade retaining nuts are the same, as Bert said, plus the pulley retaining nuts are also the same. The spindle shafts are different lengths.

Just to offer further info on this thread ... having got the MTD part numbers for the left and right blade spindles, I decided to order both just to avoid a cock-up.
So, I ordered a left spindle and a right spindle and took Rivets advice and ordered bearings for both left and right and I also ordered two new blades. The spindle part numbers were 738-1010A and 738-1128 ... the French site I found helpfully explained that one was for the right blade and the other was for the left. The order arrived today and both spindles have a right hand thread for the blade ... which is what the MTD parts breakdown suggested. One spindle is slightly longer than the other as suggested. So, if both are RH thread, surely one will be trying to undo rather than both trying to tighten. Still confused!

Yes the bolt will.
The question is what does the hole in the blade look like ?
On blades that have a star, square or other non round shaped hole their will be almost no forces trying to loosen the retaining bolt
If the hole os dead round the blade will be trying to turn the bolt

bertsmobile1 said:

Yes the bolt will.
The question is what does the hole in the blade look like ?

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It's star shaped ... never thought of that, thanks again.

And I have closed the window with the parts breakdown on it but usually a star holed blade will have a different number of fingers on the star for the right hand blade
Without checking I think the LH cut has 7 & the RH cut has 6.

bertsmobile1 said:

And I have closed the window with the parts breakdown on it but usually a star holed blade will have a different number of fingers on the star for the right hand blade
Without checking I think the LH cut has 7 & the RH cut has 6.

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I've looked at the new spindles and both left and right have 6 fingers, everything has now arrived to change spindles, bearings and blades ... will be done tomorrow. What could go wrong?