Review on Optimize Hydraulic Systems with Brush Research Standard Cylinders by Tim Hodzic

Works very well with an aluminum crank but if using aluminum make sure you oil and hone the aluminum heavily to avoid buckling of the aluminium to prevent. . And only a few strokes are enough for a nice horizontal stroke. it maintained a hole accuracy between 0.0002 and 0.0004. (Yes, that's ten-thousandths) I used 10-30 conventional motor oils according to the package directions.