BillS,
Would incidence or angle change anything when you are checking cg in that rig? IE>> nose up or down attitude have any effect on where the plumb would be ? Thanks.
Bingo field,
The attitude (of the airplane) makes only a miniscule difference in the plumb bob location but I prefer to have the horizontal stabilizer level. If one wanted more accuracy an incidence meter could be put on the stabilizer but eyeball is probably more than good enough.
Bill