I have a design I’ve been working on for some time and part of it is supported on 4 rollers. The rollers are polyurethane on aluminum hubs with 19mm x 8mm bearings. The Hubs are mounted on four long M8 socket head cap screws. But the unthreaded part of the bolts is about 0.2-0.3mm shy of 8mm on the diameter so my bearings are loose. 0.2mm, it’s not the end of the world. I could use some Loctite 680 retaining compound that I’ve got knocking about. That stuff is good up to 0.25mm it says on the tin. Then I thought how about wrapping the shaft of the bolt with aluminum foil? To test it I wet a carefully cut rectangle of foil and rolled it onto the bolt and sure enough, it made the bearing a snug fit. To try it for real I’ll wipe the shaft with the Loctite 680 then I’ll roll the foil onto it, surely this will be a better shim and fit than just the compound? Can anyone see any problems with this idea? I’ve never heard of someone shimming by wallpapering foil onto a shaft with Loctite. The 680 is good by itself but I’m thinking that if it is built up between layers of aluminum wrapped around the shaft it should be even stronger. Something feels wrong about this though. So I thought I’d ask here to see if anyone knows why I should or shouldn't be doing this. Any help appreciated.