Last night when my wife went to close the garage door, the chain
popped off of the sprocket.
Today, I got it back on the sprocket. But I just had hand surgery, so
fixing it one-handed took a long time, and alot of swearing.
I never looked before to see how much slack there was.
I notice now that there is a couple of inches of slack.
How much should there be, and if I have too much, how do I reduce it?
I haven't tried the door because if the chain pops off again, I'm
gonna lose it. :)