4.5 spacing
Hi Martin, the 4.5 spacing is only 0.5mm antidive, the sum of the 4mm spacer with a 0.5 added for the antidive. The 4 is required if you run the 1mm spacer under the front bridge, obviously as you add or subtract from the front the rear will require the same amount to be added or subtracted to keep the arms level. Example, if no spacer in the front a 3mm is required in the rear for level arm.
The setup sheet could use a little refining to take advantage of options and settings that are used but no place to document, not sure who to talk to about that though.