I guess this depends on how wide your riser is, because i could barely get mine put together , because there was so little room left on the bolt, definitely not 3/8".I have one on a Black Ice, and I love it, its light, really compact, easier to remove arrows, yet still has a good grip on them, and I shoot the FMJ's. As to the spring flying out, Its over 3/8" of an inch of thread from the point the quiver slides off, to the point you have to worry about a spring popping out and it disassembling. It's fool proof IMO, no real down sides I can think of.
Good point, I would venture that it really is gear towards the bowtech/diamond lines. What bow did you have it on?I guess this depends on how wide your riser is, because i could barely get mine put together , because there was so little room left on the bolt, definitely not 3/8".