Im trying to install my engine (OS 46LA) and mounts to the firewall and the directions say to have the prop nut washer 4-3/8 inches from the firewall. At very best I get 4-1/8 inches, is this going to be a problem? I was thinking of using some scrap ply left over from the kit to add 1/8" or should I just leave it? Anyone have a problem with this engine fitting right?

thanks, chris