The case is not as straight forward as some would seem. The kid is claiming seld defense because its all he can claim. He can not deny he shot three unarmed people at close range. And he can't deny he intended the kill them.
Thd jury must decide only one point to find him innocent or guilty...
Chuckle. Couple of years ago I bought a new Simplicity garden tractor. It ran ok for a few days and then wouldn't idle.
Talked with my dealer and learned he had put Ethanol gas in it to display it at the county fair. Afterwards it had sit for a few weeks in his lot.
Tried Sea Foam and it...
And as others have recommended, think of replacing the cable assembly. I don't know what exact model you have, but if you look on ebay, you'll see that replacment cables run around $10 with free shipping.
If you post your model someone can look up the part number.
Hard to find used. Here's a site that details to parts and part numbers. May be able to piece one together from you you have as a starting point.
My previous tractor wad made by AYP (same as your dad's Craftsman) and I had a simular problem (have yard professional rolled every spring, but turns to bumps and ruts anyway). When it died I bought a Simplicity and this seat is heaven compared to the old one. I still bounce, but its much more...
This is new, but not too bad of a price. (Or do you need the frame as well?)
When you say "small roller" are you talking about the drive wheel on the left side, or something else? (Does your Honda HRD 536 have a stripping kit installed (didn't see a small roller in the owners manual).
Is it frozen in both forward and reverse?