AR xa Turntable Head shell question

I have had the AR for awhile, playing beautiful...Recently I removed the head shell to change cartridges.to a GRADO F3 + green.... when I went to put the head shell back on, the collar screw would not tighten the headshell...so it stayed loose.
I checked online for suggestions to fix and I got one suggestion to put small section of duct tape around the neck of cartridge. I did this  and it fit snugly and seemed to fix the problem. What do you think about this fix ?