several months ago i purchased an electronics circuit from a german company which is one of our on-line sources. that device was designed to eliminate the hull recoil from heng long tank and a variation allowed it to also control cannon flash.

here is the problem. I either have lost or have never received the instructions to use this circuit. "AND" for the life of me i cannot remember where i purchased the da-m thing. Does anyone know what i am talking about, have instructions for set-up or know the source that i am alluding to? No prize other then my undying gratitude but i would appreciate any memory restart.