What are the other options I have regarding the pushrods, Tim? Look at the picture, the horn just about projects out of the servo plate. I dont think the stock futaba 4-armed servo arm has the strength after the outermost hole has been drilled out to 4-40 size.

With the engine mount, its not that simple. The fuse has 4 hardwood blocks pasted on the inside of the firewall onto which the blind nuts hold. When I was setting up for gas, I fibreglassed over these. I can probably remove them with a dremel. Issue is the difference in mounting dimensions between the 180 mount and the 120 mount is so small, I will end up with an oval hole or slot rather than a new hole. Another point is once I fill the old hole and try to drill a new one, I will be drilling on the glue line which will cause the drill to meander either side of the glue line even with a steady hand as the glue will be harder than the wood

I am attaching a couple of pics with the stock mount temporarily installed at the widest and the DLE20 proven mount held over for comparison- its just 2mm each side. I may also not need to grind the entire beam, jut the interfering bit. In the second pic, I just made a couple of dents using the dle mount as a guide, dont know whether you can see them. I think they are well inside the beam

Ameyam