Hey James
for a holder, I use an empty 35mm film cannister up turned and either use bluetac or superglue to attach the slotta base to the cannister. When the mini is finished, I can squeeze the canister and it bends slightly and the mini just pops off........
If you look at my Standard Bearer, he\'s attached to one. I\'m not sure but it looks like Tidoco uses a white one and bluetac....(?)
And in this digital age, just go along to Jessops and ask if they have any empty ones. My local one grabbed a black binliner full of them, and I just took a few handfuls for nowt. Uselful to store things in too.