as you can see i am short on rollers and stuff..... (ordered last night) but you get the idea. the bolts i'll have to cut because they are partially threaded and thats the only lenght that would work for me (45mm total). the plug fasteners which would be way better only come in imperial and i need metric. bugger that. no its not imperial i can adapt either. something stupid like 1/8 1/4 etc. nothing close to 4mm.
i could also go with 4mm shafting and collars but cutting those hardened shafts is a pita. and thats a lot of shafts! i'll try the bolts first. 8.8 steel is not too bad to cut actually.
i think i'll call it a day now.