A 6x32 fits nicely (snug) in a 9/64" hole. I'd have no problem opening up the 4 holes of the engine mount to accept a 6x32. IMHO beats using a 4x40 or a metric screw. I tried to download the manual - pretty much useless information.

Also, being a newbie to the hobby take a look at Airfield Models - an excellent source of all kinds of information.

I use 6x32 for my OS46's, Evo 52, OS 61, Saito 82, 91, 100. YS 1.10 - em, guess I'm in a rut