Well I found some 2mm blocks in my old stock and have re positioned the eye bolt on the cannon carriage, the position is not correct but serves the propose. I can now rig and place the cannon to fire position and have an adequate space between them to look "OK" . I will send some pictures. 2mm blocks are a challenge to work with. I needed to use my mirco drill bits to ream them out to run line. I do have some 1mm blocks, I ordered the just to see if it was true that they could be made. I'm not sure if I could find any line to rig though them. Under magnification, sure enough they are well formed blocks.