This is the only part that requires thinking or improv. 2 spacers, one for 65's and one for 78's would be the easiest. A spring would be cooler, and make it work just fine, but you'd want to glue it in place. A flip up/down spacer would probably coolest, but would require the most thought.
It's a grand total of about 2 square millimeters standing between this case and working with 65's and 78's.
The engineer's first idea for an adjustable was about that simple; he had a removable tab and slots to put it in for each length. The problem was, if you lose that little tab, you can't charge ANYTHING. Seemed like a serious design flaw to me, so I rejected it.
Another solution proposed was to replace the threadless connector with a regular swivel connector. It had to be made thicker however to make it fit, and besides, I think the threadless connector is one of the real improvements in the Mini-PCC. So, I rejected that, too.
Personally, I wanted a sliding tab or a spring system, but they proposed a very simple and elegant solution which takes up less space and uses fewer potentially breakable small parts. But I'm keeping mum on that for now.
BTW, one interesting idea he showed me is a mini-PCC designed to use 4 regular AA batts. It's twice as thick, and heavy as a brick, but the convenience of using standard AA batts is appealing. What do you guys think?
