If they are still using the 3 piece push block, by that I mean the push block, spacer,and the plate underneath, with bolts through all 3. Weld the spacers to the push block ( makes it a channel to follow beam) otherwise the push block cylinder assembly will be dancing all over the place as you can't get the bolts tight enough to keep the spacers from getting hammered out of posistion. Could lead to a bent cylinder shaft. Less of a problem on yours more so on the Horz-Vert units as the wedge tries to follow the grain on knarly stuff.