Well folks. I dug out my die grinder which has been stored in its plastic case for many years. Post #24 on here. http://clubgti.com/showthread.php?2...linder-head-needed!-See-list-below&highlight= Would it spin? Would it hell as like! I stripped it to find all of the vanes were stuck in the rotor! I am sure I would have sprayed inside with WD40, but I guess that after 40 years, even in its case, humidity had got in. Lots of condensation in my shed! So. It was uber difficult to get the vanes out, they are a tight fit without corrosion. I eventually managed it and lapped them up on a diamond sheet. Spins up OK now, but I need to buy oil for the oiler on my compressor! The filter/lube is from Aldi. Again I could not get the correct 10mm pipe to 1/2" BSP thread so I had to modify the fittings by brazing 2 together with silver solder. Pipe fitting drilled out and BSP fitting filed down to fit the drilling.