This spring I bought a Ms260 on sale for a great price and today I got to run it for the first time. So far I love it but have one question It's a MS260 and has a decompressor valve so I assumed it was the MS260pro with the decomp and adjustable oiler now on the bottom of the saw there is a hole with the adjustment diagram but I cannot find the adjustment screw in the hole do I need a special tool or did some models have the hole and no adjuster?