Bass bridge bearing question

[Richard Moody]

I am trying to determing the optimum bearing for the bass bridge of a
Monarch studio upright.   It has an apron.  The bridge is detached from the
apron and the apron is detached from the "shoe"(?) or strip of wood on the
SB that the apron is glued to.   If I do not shim I will have a tiny bit of
bearing, less than 1/16" (.06") or 1.5 mm.     This is from the plane of the
string wo the bridge.  So the bridge might only push up on the string 1.5 mm
or less.   The entire piano has the tension let down.

    Is 1.5 mm enough or should I go for more?   Is there "theory" or idea
that bridges with aprons need less bearing?  ---ric