"Harry Curley" writes:
Is there any advantage to some how putting the two unit together in one
line. by a yoke attachment. Would this increase the drawing power or is it a
waste of time. I now have two units. I could use then on two different lines
but I was wondering if there is any advantage to joining both unit into one
line

IIRC this coming up before in rec.ww, and the concensus was that
unless the units are PERFECTLY matched, one of them ends up sucking
sawdust out of the other one.

Nobody recommended connecting them.