"canncann" wrote in message
news:079dee6b90dc0a42be0d951008d6c9e4@homerepairli ve.com...
Can you shorten a chain driven garage door opener? I have 118" between
wall and beam in center of garage and the opener is 124".

You want to shorten the chain because the opener won't mount on the center
beam? That will cause you problems.

What you want to do is add a beam by boxing one in between the existing
beams. Put two pieces of 2x between them, then a piece between those two to
form an "H". If you shorten the chain, the door will not fully open.