craftsman 1/2 hp opener not working

Hi, i have a model #53975 1/2 hp Craftsman garage door opener that broke the washer or bushing under the sprocket. So i ordered a sprocket assembly that came with worm gear. I installed everything with not too much swearing. Now when i press the button the opener goes 6 inches up then immediately 6 inches down and stops. I know other people have been having this same problem, and i moved the collar all the way against and the interruptor cap is on. But it's still not working, 6 inches up then down.
My question is can i buy a different model 1/2 hp opener and just swap it?

Mayhem69 welcome to the forum

I may be wrong (will need to further investigate) but I think I heard the Liftmaster openers are compatible with the Craftsman boards. Here is one list this might perhaps be mentioned in:

please click here

(Liftmaster is manufactured by Chamberlain who also manufactures all Sears' units)

wow, thanks jeffie, that list will help me tons. Now i know what motor i can swap with my unit. There are a lot for sale on ebay. This site rocks and i am bookmarking it today.

Thank you Mayhem69. I am happy I could be of some help