The anxiously awaited sprocket arrived today. I milled the slot on the stock HT idler bracket to 3/8" and found the sprocket was a nightmare to align so it wouldn't eat the chain. My immediate thought was a BIG roller with ball bearings but didn't have the bearings. Thought number 2 was to run the chain OVER the brake sprocket. This gives me good engagement with 3 or 4 teeth and simplifies the system and reduces cost to produce units for sale assuming it works and makes alignment simple. Also it reverses the rotation of the pulley and makes anchoring the braking belt easy so the trailing end is anchored. I am leery of self-energizing brakes since the temperature of the belt could make reaction of the brake unpredictable. I found this to be true when I was escorting two friends who were driving a Ferrari and vintage Chrysler in a centennial parade and after slipping the clutch for miles, I almost ran over the Scottish Highland Band. The next problem is I need a #415 cranked (offset) link. I don't suppose there are any available anyhow. Plan B is now to make a 1/4" shim to add to the rear motor mount since the motor has to come out for frame painting anyhow.
This should solve the problem. If a link is too tight, I can ease the axle a mite since the peddle chain really needs a bit more slack anyhow.
DRAT-I left an O out of GOOD NEWS--BAD NEWS in the title line and can't edit it as usual.