ORIGINAL: nullibiquitous
Yea i have a saito 56 and i plan on trading it for a 72 tomorrow. On the current GP motor mount the holes are drilled for .46 sized engines. I had to grind the holes for the front landing gear off of the mount since the carb on the 56 is blocked by it. Are there any other adjustable mounts without the ladning gear holes? Id prefer adjustable because drilling more holes is not really and option.
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Don't let the number of holes in the firewall throw you for a loop. Just obtain some 3/16" wooden dowel stock, put a stick in your drill motor (as you would a bit), grab some sandpaper and run the drill with the wooden dowel inside of the folded sandpaper. Stop frequently and check to see if the size is right to plug the old firewall holes. When the dowels are the right size, use some epoxy to glue them into the firewall. Sand to smooth things out and reapply some epoxy to the firewall. There, you now have a clean slate of a firewall and can drill wherever you want for new holes.
Learning how to drill engine mounts is easy, if you have the proper instructions. RCM (now defunct magazine) used to have books that consisted of collections of tips. One of these books had articles on how to do exactly what you are dreading doing. I used to dread it too, until I learned how to do it properly. Now I drill and tap just about any kind of material with confidence. It would be nice if you could find some of those books and absorb their knowledge. Lots and lots of time savers and how-to's.
Ed Cregger