Pretty difficult to get any calipers or micrometer to measure the firing pin protrusion. Fudging it with feeler gauges, it seems to protrude 5-8 thou less than the one on my model 17.

I thought of the washer trick but thought that the compressed spring looked so tight already that only a very thin washer might fit. I will try it anyway.

(Sorry for the delayed response. I thought the thread had gone dormant. I will monitor it more closely).

Appreciate the help!