The problem: The AN-10 main spar bolts sit so close to the G200 fuselage walls that it's impossible to get a socket on the nuts. This means a lot of tedious tightening using an open-ended wrench. (I'm not sure if the 202 has the same problem.) The solution: NAS1291-10 self-locking nuts. These mil-spec parts have a smaller head and a built-in washer. Although expensive at about $22 each, they are well worth the money in my humble opinion. Available from Pegasus Auto Racing among others.