Tommy,</p>
Since everybody has an opinion, here's mine. That looks like a great design, very heavy duty which we all like. It can be used on any rails for any model but different chain saw makers make different styles of their protective rubber sleeve. Don't modify your design to make them all fit. The basic red rubber sleeve will fit any saw that's made and it can always be found as a replacement for any saw. The only thing different is the length. Either include one with your rail system or tell the buyer to get one theirselves. Now, It looks like your design will fit saws of varying length bar which is good for most non-commercial users on this site(16-20 inches). If somebody requests one longer you may have to fabricate a longer nose on the holder, but I think the best protection for the teeth on the blade will be the standard rubber boot. I've worked with a lot of loggers and you can't believe the mess in the backof the equipment trucks. The main protection for those saws iwhen bouncing down the road to get to work is the rubber boot. You don't have to reinvent that protection.</p>
By the way, This post has got it all and is one of the most interesting one that I have seen. You've got animals, toys, humor and information!</p>