If you're replacing the targets, definitely replace the springs too. Can't hurt, and never a better time. I had much less issues with mine after replacing the springs

I can advise correct way to replace drops, too much to post here. Check PM for my phone number.

When I broke a target on a JJ, I used Clay's method of mod' ing the target frames using a dremel and cutting wheel. Worked pretty well and the job was done in less than an hour for replacing all targets.

Others might prefer to take apart the mechanisms.

I do the Dremel cutting wheel technique....works well for me. And any future replacements are a breeze.

I too always take the dremel cutting tool to the drop target frames. Makes replacing targets very easy and I believe later Gottliebs had this modification from factory.

I had to file down a couple of sharp edges afterwards but no big deal.