I picked one of these cheap bar guides up just to try. Sure seems simple and rugged enough, precision doesn’t look to be a priority but I’m starting slow so that’s fine. Im planning on using a 661 Mtronic I built last year. Got it from the previous owner who claimed it lost spark. I went ahead and got the whole kit from Stihl with the module, carb solenoid and new pickup. I’m curious about what guys think of these. I have realistic expectations for it since it was inexpensive and while I’ve used run just about every make and model of saw for the past 23 years, I’ve never milled with one. I have a 72” x 30” ash trunk to test on and plenty more waiting.