With my experience, what really effects how they slide in is bending the bumps down so there's more room for it to slide in. I didn't realize that it would make such a difference until I went to the SF meet and saw other peoples and how they went in... Once I pushed the tabs holding the bumps up down a few milimeters, it slid in nice and easy... Now I'm not sure how that would change between a II and a IIa.

Matthew