So I needed two perfect circles up on the top hull,
where the Morser Karl parts sit inside.I needed to
scribe them into the plastic not easy by hand, they had
to be pretty perfect or they were going to show like a
sore thumb!thumbsdown
I found a washer with a inside diameter I was happy
with, traced this onto the hull and then taped the washer
down. Next I found a nice sewing needle and tightened
it down in my pin vice, then it was just nice and easy until
the scribing got deep enough
Beauty!