Again, out of my area of expertise. Enjoy watching, but not of much assistance on your equipment. Your rigs are like many of mine, are old enough to have parts replacement issues, although with so many people getting involved in restoring old stuff, a whole new demand has generated a new market and people are now sourcing things I could not previously get. You do have some followers that are knowledgeable in these areas, so you may get lucky. Sorry I am unable to help, again! Nick, North West Farmer