Be cautious mixing and matching hardware from different manufacturers.

Did you know that the diameter of Dubro and Great Planes 2-56 push rods are actaully different?!
I discovered this when I try to solder a Dubro threaded coupler onto a Great Planes push rod. It wasn't big enough to fit over Great Plans rod!?!

Great Planes 2-56 threaded push rods, 0.074" diameter
http://greatplanes.com/accys/gpmq3710.html

Dubro 2-56 threaded push rods, 0.072" diameter
http://dubro.com/DUBRO2005CATALOG/DU...alog_5C7B.html

Sullivan don't specify the exact diameter for theirs.

There may or may not be a problem in this case... it is just something to be aware of and considered on a case by case basis.

(I've read of people swapping hardware with UNF threads (e.g. 2-56) on ARF's that are suppled with metric rods and reporting them coming apart in flight.)