Roland VersaCamm SP-540V Service Notes page 147

Pull up the Handle part of the TOOL HOLDER with
12
the DIAL GAUGE (ST-013) and confirm the value
when the pen tip leaves the BED.
ST-013
If the value is 25 ~ 35gf (0.25N ~ 0.35N), it is OK.
If it is out of the range, adjust it again.
TOOL HOLDER
4
4-50