Its funny I met Jim and he is awesome!  The guy is so friendly and loves what he does amazing what he can do! Great job on the notching!  If u use a horseshoe nail or u make a notcher u can use a steel nail and flatten and file it down like a horseshoe nail u can get real thin notches... also try to punch them in Sawfiler had a punch notching thread was really cool!
Russ