Looks good! My only suggestion is to use a small bit of copper wire around the base of the switch housing and the brass center post to increase conductivity when you fire the mod. It doesn't need to be fancy, just so they are connected, but still allow the center post to move freely.
Gdeal used a piece of bare 16Ga copper wire & wound it around the post & switch base, I did mine just a bit differently by using a piece of solid copper wire & bent it into a circle that matched the inner diameter of the switch housing and bent the ends into a "V" pointing inward. The Brass center post sits in the crux of the "V" & the circle fits under the Delrin cup. I used a dab of Noalox on the post to lubricate it & increase the conductivity a bit more. You can also do the same thing with an old "Hot Spring" that's been cut-down to only one loop, flatten it, and make it loop partially around the center post & open the other end to fit under the Delrin cup....it doesn't need to go all the way around the housing, just enough to maintain solid contact and not move about.
I can't take credit for this - I saw a picture of someone else who did it (without the ring magnets) on some other forum & adapted it. Easy to do, and that arrangement also helps stabilize the button, and makes a world of difference in how hard the 19 hits...it's weakest point is that the switch does not make a 100% positive ground when you hit the fire button - leading to hot buttons & sometimes sparks. Getting that connection solid is the biggest bang for the buck with the 19.....
Have fun
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