Hi the new wont fit the old spring .. But can make one if you want .. I'm making 50 spring systems add on for now to give a cheap option for people .. Then I go full into production on the full machine .. To add I will be making them in aluminium anodized ..as I know the spring is heavy ..but brass was eseier to machine for a few samples ..the new spring system is a piston inside a piston and not in 2 bits like the old spring and it is all adjustable by hand not needing Alan key or screwdriver to adjust spring tension .. I have taken months on designing it . I have tried to be almost as close to a coil machine as possible and be good at lining solid colour and mega soft grey wash at ease simplicity .. I think I have got it right but I can be to confident because I only judged on my tattooing hence why I let you guys test run it .. Honesty was the key. I did give the boys at my shop a run and I had fight for it back but they love everything I make cause its free lol .. As I say I respect you for this truly great full ..