This might be a bit off topic, but i had an SRAM cassette that is held together with a 1.5mm hex. I took it apart and bought some pvc to slip over my cassette body to use as spacers. I was then able to play around with and get a nice straight chainline and use various cogs to see which works best for me to try out SS. This won't work with shimano as the last couple of cogs are welded together.