Ok I am new in this area, I'm used to a couple of small wood screws to hold an .049 onto an 1/8 inch plywood firewall..
this echo is I think 21.6cc and has 3 screw machined holes that I would have to get to from inside the plane because ..well you cant get there from here if you know what I mean....and spacers to get the rear nut off the firewall,,,will this hold up ok with just 3 bolts?....Rog