LR Baggs M1 - Manual (Page 4)

Using the internal nut
(be sure to include the
flat and star washers),
set the proper depth
that will allow the entire
smaller threaded section
to protrude from the
instrument (see figure).
With the jack in place, lay
the remaining washer over
the threads and attach the external retaining nut until it’s tight. Finish
by attaching the strap ring (it should cover the retaining nut and
washer). Note that asserting too much pressure may crack the finish.
3.3 Pickup installation: Begin by plugging the strapjack harness
or the 10’ cable into the pickup. If you are using the 10’ cable,
loop the cord beneath the pickup and push it into the strain relief
recess on the underside of the pickup until it pops into place (the
loop between the plug and strain relief should be rather tight).
Now loosen the clamp screws on either end of the pickup’s top
plate until the clamps are open enough to accommodate the
guitar’s top thickness. Then slide the pickup into the soundhole
and tighten the screws. For small soundholes, it may be necessary
to remove one or both clamps, slide the pickup into place, then
reattach the clamp(s) once it is correctly positioned. When
reattaching the clamps, verify that they slide into the slot that is
molded into the pickup housing.
Tighten the screws snugly, but don’t overdo it -- this can damage
the pickup or guitar finish. If you are concerned about the
possibility of the M1 Active damaging the instrument’s finish,
consider applying thin cork pads (not included) between the
clamp and guitar. However, note that the clamps have been left
tail
block
smaller
threaded
section
protrudes