Garage Door Screw Drive Fix

Garage door stopped opening. It shut fine, but it kept slipping.
"Martin S80". martin doesn't seem to sell that model anymore. Probably hasn't since 1970.

Google-ing "screw drive carriage assembly"... It looks like a Genie something something. Almost the exact same mold. $18? I don't need the whole thing, just the teeth... "rack" Search google images, That one looks right

Looks ok... hmmm. garagedoorstuff.com? For 8$, I'll risk it.

I probably should have pulled it out to look at it before ordering....

That was a whole lot of 1970's grease there. Phew looks ok. That was fairly worn down.

Fits...

Defiantly not authorized, but I don't have the owners manual.

All greased back up.
Runs Smooth and a lot quieter now.