Hi all. I have a Cressi Cherokee Open speargun, which came with a single 17mm band, but is capable of using two bands. The 17mm band just broke, and I want to put two bands on it now. The shaft is 6.5mm, so I'm guessing two 17mm bands would be too much power for the shaft? On the Cressi product page, they show the gun with two 16mm bands in one of the small images in the right column. That still seems like it might be too much? Any suggestions on what diameter bands I should use? Also, what's the difference between small ID and regular ID bands? Thanks.