Today I ordered service kits for my Mk2, Mk5, SP109 and SP555. Several months ago, I picked up Vance Harlow's book and I think have read it cover to cover. In the past couple of weeks, I've accumulated the necessary tools. Most of them I already had with the exception of a torque wrench. I fabricated a hook pin spanner from one half of a pair of channel locks, a 1" yoke retainer socket and three o ring tools from a 1/2 inch oak dowel. Today, I disassembled and reassembled the Mk5 as a dry run to familiarize myself and test out the tools. Everything worked perfectly. I think I enjoyed fabricating the tools as much as tearing in to the Mk5. I also have a Mk25 but will first cut my teeth on the Mk2 and Mk5. Awap, if you are reading this, I'll be calling you when I start on the Mk 25 to ask you to come over and look over my shoulder while I tackle it. Looking at the schematics, it's obviously a bit more complicated. Wish me luck guys!!