Well, I got the lead out! These caps are thick, about 1/8". Do not try to just poke or punch something through them, you will push them into the screws, and/or break the housing of the carb. I put a very small ball end dremel bit in, bored a very small hole in each cap, screwed a sheetrock screw very lightly into the hole, and gave it a little tug with the channel locks! Worked great, took about 5 minutes total! I turned the screws out 1/2 turn each, bike runs great, idles better, (even when cold w/o choke) and no more popping out the exhaust! Bucky, try either using a product called Deep Creep, or Free All. Both of these work great. WD-40 just doesn't penetrate that well. I work on old cars (30's era) and Free All gets those rusted bolts out with ease!