I installed the BAS system in 4 of out planes. I did drill the spar like the plans said and yes it was a pain attaching the nut plate working through a little hole on top of the spar

Thank you for the answers. I was going for the AMSafe, but there is currently no STC for 3-point on the Skymaster. I guess I like to have that feeling of being securely connected to my seat. I don't have that feeling with a 2-point system. I'm going to investigate the B.A.S seatbelts at least for the pilot and co-pilot. I was hoping that I could do the same to the seats behind me, but if I have to stay 2-point on those, I can live with it.

Karl

I installed the BAS system 12 years ago and I have no regrets. It's a great system and I think the angle that the upper straps are at is comfortable.