TKC,
I did not photo the lock up, when I have in the pasted I hardly ever post them unless its going to a customer. The engagement looks alittle deep from that angle, but its is about 1/2 to 2/3 the lock face on the bar.
I still do thumb studs and oblong holes, but I like discs, they're ambi and I think, clean looking. Don't read this as an arguement, I half had the idea of carring this one so I was angling it toward me, but we'll see.
I got the original design from Dave Clark (no relation) and this was enlonged about 1" from the orginal, then I tweaked that a bit.
Jason