It is a 2 part epoxy in small squeeze tubes, mix a little of each part together with a small nail. A panel nail, or a #2 or 4 finishing nail work.
Put a small piece of masking tape on the underside of the first adapter, the 801 side of the 801batt-510atty adapter, tape pushed flat over the positive terminal part.
Poke a hole in the center with the nail or a tack, so you see the opening running
through the adapter
Put a little of the jb weld into the hole, I used the nail point to pick it up, the head to tamp it. It only takes a little to fill that tiny space, and it doesn't have to come our the other end.
Remove the masking tape and let it dry overnight.
It is actually quite fast to do, like 2 minutes including mixing the epoxy, just don't over do the masking tape.