[Lous69]

I think I understand your question. It is a good one.

The spring I used is stronger than the spring on the slave cylinder so by threading the nut down the shaft I was able to preload the slave cylinder similar to how the clutch fingers will preload it when it is installed. I was careful to thread the nut down enough that the slave cylinder was just shy of it's maximum compressed position before I bled the system and ran the test for slave stroke length. Adding something to the fixture to absolutely prevent over stroking the slave cylinder would be an improvement.

Also, I used a spacer under the slave cylinder that supports the back end of the slave cylinder exactly as the transmission does. That could be very important for slave cylinders that are constructed in a way that would allow them to blowing themselves apart without proper mounting base support. I believe that is why to be safe, some people advise you never should compress a slave cylinder until it is mounted.