David, you can do it yourself but need the proper size brass tube. Be prepared to pitch it if it doesnt work. If you pull it apart you will see the brass tube pressed fit into an aluminum plug. Heat to pull that brass tube out and save for the hole location you will have to drill later. clean, and look for debris. look to see if that brass tube was deformed. There is an oring in there also that if you are lucky can reuse if you didnt use too much heat. press fit back together with new tube, reassemble, silicon grease and see if it works. I also channelized the action on mine since it was a very old version.