These instructions were given to me by a Troy-Bilt mechanic but I have not tried it yet. Good luck.
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As for replacing the double belts, its a bit tricky, but not that tricky! Here's how to do it:

Move the clutch handle to loosen tension on the belts.

Then, first thing, take forward belt off lower front pulley, and rear belt off rear upper and lower pulleys, and slip it out.

Then remove front belt.

To install the new belts:

Hang front belt over the front upper pulley, but not the lower one.

Slip the rear belt in under the front and into the rear lower pulley, then install it in the top rear pulley.

Then slip the front belt over the lower front pulley, and its done.

You may have to adjust the sliding block, but that isn't too hard to do. It might not let the handle stay in position if its out of adjustment.

That seems smooth and easy. I was wondering if there was an advantage to pulling the reverse disc off. It doesn't seem necessary. Thanks!

My 1985 Horse uses one 9245 belt, has two sets of pulleys though. The older models that used two belts used a 1128 I believe. I think the difference is only 1/4" in length. Check to be sure your using the right belt. Two speed models used a different belt than the four speed model. REJ2.

Ah, so don't believe the last guy put the right belts on. That's a real posibility.

I saw somewhere on the web, a parts site that showed the belts and their application by serial number. Try Zacm.com. I'll do some more checking. Post your serial # or at least part of it. REJ2.

Okay, heres what I found out. If your serial# is prior to 315295 it uses two 1128 belts. If after 315295 it uses one 9245 belt. Info obtained at the troy bilt tiller club on yay-hoo groups. REJ2.

Didn't get to check it out. Will do and thanks for the tip.