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I am converting a single garage door to vertical lift. The way I have donne it is to cut the 90° arc tracks in the center, then re-mount them so that the tracks each make a 45° arc before continuing vertically. This worked beautifully as I didn't need to purchase any new track or metal supports...

I am converting to a vertical lift, and I would like to use the existing motor assembly. This one is belt drive, and I would probably convert to chain drive, so I need to replace the sprocket on the motor. It's about 1.5" diameter... and I don't see any set screws or C-clips holding it on. Is it...