Also, I have posted this a hundred times before, but you can make excellent fat grips at home for spin lock dumbells or even standard barbells by using PVC pipe ... cut to length, slip over the dumbell / barbell.
I have used 2" and 3" pipe and even 5" yes FIVE INCH PIPE to make a kind of log barbell.
You can make it not spin (tighten screw locks) or spinning (cut it a bit shorter) and that makes a "rolling thunder" type hold.
similarly, PVC pipe over climbing rope = thick bar for pullups.
endless applications of the stuff
of course, damned hard to use in a commercial gym