I did the long bolt and springs mod on my RV-8A. However, one of the master cylinders developed a leak on top that required a rebuild. The rebuilt cylinders had enough "return" / recovery to eliminate the need for the springs. Kept the long bolts though. Note that the spring installation was not the cause of the leak; the shaft had deformed which allowed fluid to escape under heavy braking. Hopefully the long bolts will prevent the master cylinder from twisting, and reduce wear on the shaft.
2000 RV-8A | O-360, FP, G3X Touch, VP-X, EarthX
Eastern Shore | KESN