Tom from SWISCO responded:
June 6, 2011
They both are very similar operators. The only difference is the zig zag arm that connections the 5" arm to the operator. The 39-089 has a longer zig zag arm than the 39-187. It is easier to see the zig zag arm by viewing the operator from the back. Here are images of the back view of both operators.
PS: I also just found this similar discussion regarding the right handed version of these operators.
|