Okay here's the deal. I used the measurements & drilled the firewall of the Dragon Lady ARF that I am putting together, for the stock engine mount that comes with it. I guess they are some kind of carbon fiber, or nylon, or some kind of black plastic, not really sure exactly what they are made of. Anyway I got it all set up per the instructions, then scored a good deal on a new Saito 100. I then found the cliff-note in the instructions: you may want to use an after-market aluminum engine mount if using a bigger 4- stroke engine. I got to looking @ the Saito on the stock mount & decided they are right. So I got a better aluminum engine mount for that size engine. Of course now the holes in firewall are wrong, just enough that the holes would actually intersect each other a little bit, not wide enough to clear the existing holes but just a little wider so that they would be partially into the holes I allready drilled. I decided to fill the holes with dowel. I re-drilled the holes just a little bigger to match a piece of hardwood dowel I have. I left the dowels about an eighth of an inch too long, so I would have some sticking out to run a good bead of thick CA around after first glueing the inside of the holes with thick CA. It has set up very well so far. My plan is to let them cure completely before using the Dremel to cut off the ends & sand it back flush to the firewall. Then I will start all over with the new measurements & re-drill the holes. So what do you think, is this gonna hold ok? If not I could add a piece of hardwood ply that came with the model for use with a smaller .60 size engine. I'm trying to get around doing that because I lined it all up that way to have a look & then I have to slide the engine so far back into the mount that the back of the mount rides right up against a carburater bolt. So I would rather not add the new piece of wood unless I absolutely have to. Please let me know if you think this fix with the dowels will work. Thanks in advance for your opinions.