What dia. axles are used for the asiatam hull. Do you have a photo of the axle/bushing? I use a 5mm bolt, but the metal idler wheel came with a 5mm shoulder bolt with 3mm? threads for plastic mountiing. To install the bearings in the idler, I removed the existing bushing, I then drilled a 5/16" hole (I don"t have any metric bits) in the inside wheel half, from the inside, almost all the way through. I also enlarged the hole left slightly so the spacer used later wouldn't rub. I left a thin lip on the inside to keep the bearing from pushing all the way through. I then pressed two bearings into the wheel from the inside. I cut one of the original bushings in half to use as a spacer between the idler and arm/tub. I'll try to get photos later if this isn't clear. This made my idlers very solid but free spinning. It's also easy to adjust in/out as needed.