And another brand with these spings.

http://www.teamxray.com/teamxray/new...05&catName=RX8 Conical Clutch Washer Spring Set Instruction Manual

The funny thing is that all do come with a combination of 0.4 and 0.6mm while I did find out the 0.5 is working very well. Maybe playing with one more or less or more of the one than the other you can play more with the strength than with only a set of 0.5mm springs.

On the other hand, when you have found the right spring like the Shephers or the Orion square you do not change it.