I have a Sears 26HP lawn tractor. I'm trying to remove the electric clutch assemble from the engine shaft. However, I do see a hole where I can insert a screwdriver or such to keep the entire shaft from turning when I try to remove the shaft nut. Does anybody have any idea how to get this thing off? Any help would be greatly appreciated.

If you have access to an impact wrench it would help greatly, if not, you may try to get someone to hold the blower screen on the top of the engine to help restrict movement.

I do have an impact wrench but did not try it. Thank You I'll give this a try and let you know how I do.

The impact wrench will usually do great to remove and the bolt.