Great...I just tracked down and bought a blue Husky 3/8 combi gauge (roller guide/depth gauge) then bought a Stihl 33RS chain in 3/8 (the last they had). Now, according to info here and there, I will have to modify my Combi gauge for it to work on the Stihl chain. I think that I will just free hand file the Stihl chain till I find a suitable and inexpensive guide for it and use the little blue combi gauge on the Super 70. Oregon has told me they don't make or sell a roller guide. None of the local Stihl dealers don't know anything about the RS chain not being available in 3/8 and most of the mechanics at the Husky and Stihl dealers, that I spoke with yesterday, say that they will be glad to sell me a new saw after I burn mine up with that Mobil Racing2T at 32/1. My saw's manual says to use Makita/Dolmar oil at 50/1 or another brand at 40/1. The Husky guy said I should use the Husky syn at 90/1 and the Stihl guy said I should use the Stihl oil at 50/1. They remind me of politicians. Over the phone the young lady at the closest Dolmar dealership to me said that Oregon makes all the chains in existence. I should have asked about bicycle parts. I'm still looking for the friendly/helpful/informed small engine shop to hang my hat on.