Poptop - I have a confession. Your clear aluminum top was one that didn't come with a tip in it, and I meant to keep that particular one for myself, 'cause I screwed it up. I couldn't get those tips in for the life of me. I bored out the hole for the tip on that one on my drill press with a bit that I thought was still smaller than the tip... It wasn't. I used some ziploc-bag type plastic around the tips shaft, and it seemed snug. Sorry I didn't remember to tell ya sooner, I owe ya one.
I finally figured out that I could use the tailstock of my lathe sort of like a shop press to get the tip centered and nested, and then to the floor with a rubber mallet to get it all the way in there.
I can't remember, it was Rota or Romano that ordered a clear one that I sent with a blue cap. I didn't get enough clear ones, but Marco sent the one with my logo in a red cap on a clear body. I sanded off the red (not a fan of the red, I asked for blue, dios mio) and put it on a blue body, so that's where the blue cap came from... hope that's ok, lemme know.