complete sled junkies team secondary spring conversion kit comes with weights and springs $75 shipped for an M-7-BB or 800 thuis kit is what I used on my sever 900M-7 at 10000 ft
comes with dalton weights I thing 70 and a dalton helix he ground the # off and the springs are 140-290 and the secondary is painted and of course the adapters for the team spring I had minimal bet heat with this set up