"My Old Tools" wrote in
:

Contractors saws have the trunion attached to the underside of the
table, usually 4 bolts. Loosen the 4 bolts and shift the trunion in
the appropriate direction, then make sure the blade is parallel to the
miter slots. In some cases, the bolt holes don't have enough slop to
get it centered. In that case, call Delta if it's new, or get out the
file if it's not.


Ross & Leon make good points.

I'd do the trimming on a home built insert, or a cheap, replacement insert
from a dealer, rather than the original, should you choose that route.

In fact, a zero-clearance, or near-zero clearance insert is often a pretty
good addition, if you provide a splitter option.

Patriarch