Any advice out there regarding building up bottom rollers? I am a proficient welder and have a in house machine shop of my own. Just looking for some advice. I have been warned the ID bore will shrink if they get too hot while welding. No one seems to do repair work such as this anymore? Dealer cost is $192 ea which I think is high for these small rollers. Machine is a PC40-7 w/steel tracks. I need factory specs regarding OD and width also.