quite separate issues
why combine their effects ?
how do you tell one from the other ?
a mounting system can be improved/modified, the wb is as it is
lapping is a quite similar issue
test 'out of the box', or after lapping to do what the mfgr could not be bothered to do ?
(if in fact one actually is capable of making an improvement, sometimes yes - other times no)
most here are interested in the wbs' performance capability and to measure that one needs a repeatable mounting system
providing truly accurate info for newbies (no offense meant) is not possible as one would have to apply too much and too little grease, tighten unevenly, apply all combinations of bending moments from the hoses, etc. etc.
just view wb tests as describing the wb's best possible performance - always relative to that specific test bench
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