I cross threaded the threads on the shaft the arbor fits on and have had no luck repairing the threads - is there an alternative to replacing the motor? The Dewalt shop quotes a $125 fee to fix my never-used router!! bummer

It sounds like you may have stripped the threads on your crank bolt. You may be in a situation where the only fix is to either, re-tap the threads using the correct size tap or replace the crank shaft.

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

It may need an adapter to work on the 128cd trimmer. This trimmer uses a 3/8" right hand thread for the arbor shaft.

If you can't measure it directly, take the nut with you to a hardware store and find a bolt that fits it. But you can easily measure the pitch with a decent ruler. Just count the number of threads in one inch. Count the threads from one peak to the next, So if the first peak lines up with zero on your ruler and the thirteenth peak is at one inch, this would be a 12 tpi (threads per inch) pitch. If you can measure the diameter of the threaded shaft, you will find that the actual diameter of the threaded part is just a little smaller than the nominal size. For instance, a 5/8 diameter thread might measure about 0.610 inches.
Good luck!

If you use a nut, the arbor nut will not hold your grinding/cutting wheel properly and you'll use up threade the arbor nut needs to tighten. What you need is the clamping flange, Bosch part number 3603340501. If you have a tool repair center near you they may have one or can order you one. If not, you can get one on sites like www.ereplacementparts.com.

you might want to check the inner bore on the pulleys and the arbor shafts for wear. The pulleys should be somewhat of a snug fit. Then if they are OK I would replace the set screws and when reinstalling use some looctite/thread sealer to keep them from loosening. (BLUE) should work well for this.

Clamp the shaft behind one wheel with 'Channelock' or 'Visegrip' pliers, then tighten both nuts. Check the new wheels for 'off-center' running by spinning them with your hand. They may fit the shaft tight enough that there is no centering adjustment--use a 'wheel dresser' (either a stone type or a multi-wheel type) to true up the wheel so that there is no radial wobble. Hope this helps!

If you put a wrench on the nut on the other end of the shaft, you have a 50/50 chance that the nut you want loose will come loose. If the wrong one comes loose, you can remove that nut completely (and the wheel) then take the nut with you to the store to buy another one. Then put two nuts back on and tighten them together as a jamb nut. Then try again. If the wrong nut still turns, you have to tighten the pair of nuts together tighter. good luck

Hi edward, looks like you posted the same question twice. I already answered the other one. good luck.

The nut is binding on the arbor because the threads are buggered up or clogged with something. It could be the nut (which is probably brass and soft) or the arbor (which is steel). If it got a little cross threaded, the damage will be on the nut. It might be the arbor if the arbor took a whack. Once you have it apart you should be able to see it - although the damage might be pretty small. You aren't likely to have a tap and die to run through the threads, but you can probably fix it with a little rotary tool (like a dremel) using a small disc. If it is the arbor you can use a triangular file. Or you can buy a new nut. I hope this helps.

go to sears service center and get a new arbor, and ask them to show you the motor and arbor assembly drawing. it should show how the arbor is attached to the shaft.
you can pull the arbor off with a pulley. you can get that from auto parts store.