Hey, three4rd,
Put the brake pedal down, which puts it in neutral, then let go of the pedal. Adjust the bracket until the wheels stop spinning. Then, go forward, reverse, with the speed lever, then hit the brake pedal again, and see if the wheels stop. Basically, just adjust until when you hit the brake, it goes into true neutral. Do not lock the brake pedal down, that applies the brakes and keeps the wheels from spinning (to some degree anyway).
Glad the engine is running well. You are getting close to being done. You'll want to keep it once it's back up and running well.
And just for grins, I had to replace a cork gasket a couple days ago on one of my 129s. Split it to do it. Used two floor jacks, one on the rear end, which I then turned straight up so the fluid didn't run out and one with a 2x4 across under the frame. I had just changed the fluid and filter, so didn't feel like draining it again.
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