Damn those springs are far too expensive (imho)!
I'm just going to measure them and buy a bunch of different ones from ebay.
If that kit was £20 Inc postage to the UK I'd buy them. £50 is ridiculous!
https://youtu.be/9En9Kft-LWc
Or torsion springs:
https://www.isrtv.com/forums/topic/2...00-spring-mod/