Quoted from Cobradvs:Yeah I'll give it a try. What foam did you use?
I used these: https://www.marcospecialties.com/pinball-parts/23-6534-9
One piece of advice is to make sure the metal surface you're sticking these to is good and clean. The adhesive on the back of these is not super strong and if there are bits of the previous foam piece still on there, the new piece will fall right off.
Oddly enough I find your thumb to be the best thing to clean the surface with. You can pull that target down through the playfield without needing to unrivet or desolder anything. Just undo the two screws holding the bracket to the playfield. Once you have good access to it, I just rubbed the old adhesive with my thumb on the surface until it all comes off. It will roll together like any other glue would and then just pick it off. No need to antiseptically clean the surface. Just get the old adhesive off and you're good.