@ kelvin o
I get the springs from Brütsch/Rüegger AG, a swiss shop, http://www.b-r.ch
this stuff around the orange boot is silicone, it's only fixed on the upper shell and seals the gap between upper and lower shell. In addition the gliding parts are treated with silicon spray, but this boot moves easily anyway.
Does your boot not flex without spring or without RAB? Indy with standard RAB does not work, the RAB itself (without spring) blocks the boot by minimal movement. Have you tried this 5 position part in walk mode, as mounted on suzuka? If then the boot feels too soft, a modified RAB is worth, otherwise you definitely need a softer boot or a softer tongue.
@ The Blitz
order? sorry, I don't have the time to machine these parts? but I can give you the CAD drawings?