Wolf, not really. You are in TO right ? I can give you some pointers. Can you post a picture of the recoil unit ? It is just the same one from Heng Long as their BB unit, not the flat white taigen unit, correct ? The elevation unit stays the same for BB or recoil if it is Heng Long.
I have to say though I haven't done it in a long time. It is on a RX-18 board ?