Don't feel dumb...I can't count how many times I've looked at something and ended up coming back to it to determine that it was the problem
As for the key: Flywheel Key X-42-15-S Order now for same day shipping. 365 day return policy. RepairClinic.com I'm 99% sure that this is the one that you're looking for. I did a search for the CV491 Key (If you have the same Kohler 17.5 engine that I have), and this is what I came up with. (Sears confirms it here: http://www.searspartsdirect.com/par.../Model-CV49127502/0598/1503500/P0050360/00004 )
Repair Clinic also has a video on replacing it, but it looks like you've learned your way around that flywheel (video here: https://www.youtube.com/watch?v=gfoIJHj6MzM )
I hope that solves your problems! It's about as cheap of a fix as you can get.
As for the key: Flywheel Key X-42-15-S Order now for same day shipping. 365 day return policy. RepairClinic.com I'm 99% sure that this is the one that you're looking for. I did a search for the CV491 Key (If you have the same Kohler 17.5 engine that I have), and this is what I came up with. (Sears confirms it here: http://www.searspartsdirect.com/par.../Model-CV49127502/0598/1503500/P0050360/00004 )
Repair Clinic also has a video on replacing it, but it looks like you've learned your way around that flywheel (video here: https://www.youtube.com/watch?v=gfoIJHj6MzM )
I hope that solves your problems! It's about as cheap of a fix as you can get.