Hi there, thanx for the posts, i went to the place yesterday, well, after looking at the mech i saw the 2 brass screws, undid them with a flat head screw driver, and the peace lifted upwords, the 50c coin fell out, i inserted the R2 from the bottom, let the peace down again, screwed the brass screws back, and it worked fine. It's a simple process, but it was just a bit tricky to get the R2 coin in, but i managed.
Thank you very much