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I got the spacer made for the Hydroboost out of the correct stuff, I also made a little bullet to go inside the Master Cylinder. The little bullet was needed to make the contact between the Hydroboost the Master Cylinder. It's pretty hard to measure but the best I can tell I have between 5 and 10 thousands clearance between the push rod and the piston in the Master Cylinder. I'm going to look at the spacer a little closure, I would like to have a between 10 and 20 thousands.