No, definitely not there! That location is the exact opposite of what needs to be accomplished. The copper washer needs to go between the button, that's the part you push on, and the lock ring, that's the part that screws into the bottom of the mod last before the button.
Do not add extra components on top of the firing pin/magnet, that only increases the gap between the button and the lock ring ledge. Doing this makes the vertical edge of the button the only conductive path between the lock ring and button, which is why so many mention having to tilt the button to fire.
Adding that copper wash there does not increase conductivity, the current still has to go through the firing pin/magnet.
The Copper Washer in the picture is used to shorten the throw - the wire mod is used to eliminate the inherent problem with the conductivity of the switch (which causes the "hot button" & "Sparking" problems). Your method is another way to accomplish what the wire mod does. My copper washer was to eliminate the long throw issue. I had already done the wire modification (works perfectly BTW)...I should have been more clear ....
I have two 19s (Stainless & Brass) - both set up with the wire mod & copper washer - both fire 100%, no hot buttons, no sparks, have a nice short crisp throw, and I can set them down without them firing, even with an Ithaka (very heavy atty) on top.
Works for me....
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