OK,not much tech here but it is basically free, simple and easy.Not only did this work on my 9500 rpm G/MP 287" but it works on just about any combo w/o serp belts. Got 4 pics.The 2 with the orange generator bracket is off the race car and bottom 2 are off my 454 1970 Chevelle.Constant problem in modified production was that you had to run street equipment including charging system.Generator in the case of my 57 chevy.After numerous belt tosses I drilled a hole in bracket just above where the fanbelt ran and bolted a stud/cutoff bolt,etc.Position just above the belt pretty much in the middle of the belts long run to the generator.Never lost another belt over many runs at 9000 plus.I will continue to use this when I get the 57 back nostalgia racing. Same with the Chevelle.6200 rpm motor.Flipped the belt a couple of times at the drags.Welded a stud to a plate and drilled hole in alternator bracket.By loosening bolt you can adjust spacing to the belt.I close it up to race and back off a bit on the street. Sometimes the belt gets a little shiny but never tore one up.And yes,I do spend effort to get things lined up.I did run deep pulleys on the 57 and have got to get a deep alt. one for the Chevelle but have not lost one since doing this. That's it,stupid easy and free.