JCWhich bell caps did you buy for your STM shorties? I'd prefer the 30mm ones, but there's hardly any to choose from. So, I have some of each of these in my cart now. Have read their reviews, discussions, etc., and don't foresee any problems with them.
$7.35 Acrylic SUBTANK Mini Bell Cap (6 Pieces) - 38mm / ships one of each color at FastTech - Worldwide Free Shipping
$1.47 Acrylic SUBTANK Mini Bell Cap - translucent / 37.5mm at FastTech - Worldwide Free Shipping
Do you see anything I might be missing about them? They look to be fine IMO.
I have a bunch of the STM and even more of the TTM, as well as some extra bases and rba Plus. So I should be set if I get the bell caps above hopefully.
Be sure to read the reviews on ft. A couple of peeps have tips. And pics for the clear one you listed.