phantom grips arnt such a bad thing, do a search here there has been good discussion over them, also "sprung load locker"

i have made one myself for someone else but they havent tested it yet,

i actually bought one from another company though for $250, and used it in my rally car, it was really a good thing

the one a made cost about $30 (incl $22 for springs)

and it's not hard to make with a mill if you know anyone that has one

i plan to make more, but have been so busy with other stuff (injection) so it hasnt happened yet