Old Fart, do you have an A.I.S / Coles tool satore near you? or a super cheap. You'll find the nipple that you want there. You might have to buy some grease nipples but then all you have to do is run a small (1/16th) drill down the guts. That is assuming they aren't already clear. Other alternative is to go to nearest largeish aerodrome check out the spare parts supplier (Aviall comes to mind) and if you don't find what you want there get back to me