Hey Ted!

I've never seen the "J" hook on an IG pool but wanted to respond.

You've got to get the broken crete out from behind the liner as the FIRST step!

If you can post a pic of the channel (or PM me one, if you can't post pics), I may be able to figure out a 'band aide' for it, otherwise, look for a competent and reliable 'pool dude' in your area.