Can I add weight to a Vespa 300 handlebar? In other words, is the steel tubing able to hold lead shot or BB's inside w/o coming out a hole? I could find my own answer were I to take all the plastic off but plastic tabs are said to be notorious for breaking when that's done. Heavy bar ends are quite pricey and my OE bar ends are already the same exact weight now as a heavy version of a Throttlemeister cruise bar end. Tubing with holes or not?