B-band Ukko Installation Instructions Manual - page 12
Manual is about: contact mic system for drums
of
17
9. If the depth of the drum is so the preamp does
not fit straight vertically between the bottom and
top hoops, then, in most cases, the preamp can
be rotated so it is angled to fit.
10. Thread the connector and lead wire from the
contact mic through the nut.
If this does not fit, remove the flange carefully.
Remove the flange so that the preamp fits flush to
the drum shell.