Tony and ALL When you get the measurements worked out let me know. I own a machine shop and two 961 SF's. I will make a short run of your dipstick modified parts out of stainless and distribute to our fellow 961 owners (no charge) Thanks for doing all the homework on this issue. As I stated earlier in this thread, I have been hit by this problem (excess oil in the airbox) and have fouled an air cleaner. I have talked to several dealers about a new air cleaner element, and no one has a unit in stock. I am actually getting new parts from Krazy Horse in the UK. I am ordering a short set of pipes from them, and they were more than happy to help me with other parts. (Dozer helped with contact info at Krazy Horse, Thanks Dozer) Additionally, I am getting 2 new primary gaskets, so I can remove the primary cover and take a look at the starter system (ring and pinion gears) to see if that can be improved. My shop is production gear manufacturing facility. We make gear boxes now with a gear tooth feature that helps synchronize engagement of gears. I also want to look at the ring gear mount, Richard 7 has posted some observations that I would like to look at in detail and see if something can be done about the mounting of the ring gear. I will update my findings once I get the system dismantled.