I was assembling a recently purchased Sig Senior Kadet ARF. I didn't get very far. I got the servo in the left wing, started to do the left wing servo. The ribs holding the servo, and the ones next to them were crushed. Called Sig, they asked me to pack it up and send it back to them. So I started on a Sig Rascal 40. Got both aileron servos installed, the fuel tank finished, then the engine mount installation. Only the left from bolt would go in all the way. The other three would only partially go in. Apparently when they fuel proofed the firewall area, they got some of the goop in the blind nuts. What do I do about this. Can I get some hex nut 3.5 mm nuts and try to force them through the stuck parts? I sure don't want to call SIG about this plane too. Or is there some other way to clean them up? Thanks for your help.