I just removed the 3 jaw chuck that came on the TH42 lathe. It measures at 5 inches diameter. After some cleaning the only markings I could find were some numbers. On the backside was 113 with 55 under that and L under that. It has what appears to be an small octagon stamped on the front and back. I am not familiar with chucks, does these markings have any meaning to anyone? Thanks, Gene