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https://www.ebay.com/itm/385282254699?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=-etjxtdcra2&sssrc=2047675&ssuid=hXe1H8l0Rb2&var=653169028874&widget_ver=artemis&media=COPY

simple gear motor from eBay and a 10mm x2 lead screw

Mid 50's Buffalo 15. updated a bit with a VFD , new bearings reground the spindle taper, added a power lift

mine is 2HP it was 1HP, paint is detroit diesel Alpine Green rattle can

good find, I have 2 of these , 1 given to me the other a curb find, I got 20 years out of 1 before rebuild, here is some useful info

mounted a MR11 led on my Buffalo 15, plenty bright 245 lumens

you dont , it uses its own receiver and you connect each output to each opener

these are simple relay output,

8 channel wireless remote, you can also use MyQ app to control from phone

Based on your photo and a manual the bearings are 30mmx55mmx13mm (6006 series bearing) so if you can measure the distance between the retaining rings and subtract 26mm (1.024"), the width of both bearings, you will have your spacer thickness the OD will be 55mm. ID will be ≈40mm. The groove...

sounds like the sensitivity controls which sets the force needed, if your door is heavy or the springs become weak that can cause the opener to stop, the motor coupler broke, could be working the opener to hard.

My uprights are 3 x 1/2" 1018 cold rolled and the holes are 7/8" and the pins are 7/8" I had to hone the holes with a flap wheel. I have no distortion on these holes. the 3" uprights with 7/8 holes have a yield strength of 140 tons

here are some of the drawings

I drilled in a milling machine 7/8" and I used 4140 Pre-Hard Cold Roll for the pins , I set the pump up to put out 3200 PSI which gives 20 ton on a 4" cylinder

I used pex pipe and ran it thru sprinkler poly pipe and trap the water before it gets into my tank,

1940's Yates American converted to metal cutting with some pulleys, VFD

$90.00

Malco made in USA, they bought the original vice-grip plant and improved on design , Vice grip now made in china and quality is less than original US made

made the drum 6.700 OAL with new shaft

when I drilled the holes I welded all 4 pieces of flat together and used a annular cutter. the cylinder is a 4" and pump is 3200 psi which gives you 20 ton