are drilled in the
piece have to be
deburred on both
sides, If ya don't
the rivets or
screws will not
tighten all the
way, eventually
leading to cracks.
Every hole and
edge has been
deburred, every
corner is
rounded, there
are no sharp
edges or corners
on my tinwork!
to do is another one for the other
side. BTW The tunnel sides are
two pieces, not one. I hide the
seam under one of the uprights.