i dont consider them rebuildable. fall apartable yes but not rebuildable. if anything is suspect on them, bin them, if the adjuster thread is tight you know they'll push the adjuster bolt thru in very short time. if the roller tip wheel is not spinning freely, break in half time is not far away. i was fortunate enough to have Josh supply me with loads of spares but the spares bin is getting low. this is my last season on the junk, next season is upgrade time.