Okay, I am extremely busy through Wed. Hopefully, I can finish up the complete tutorial by next weekend. However, in the meantime here is my version of the installation of the mainsprings and hammers.
Tools:
5/32" pin punch
1/4" pin punch
flathead screw driver (approx. 1/4" blade and 8" long - longer is fine)
bench vise OR several c-clamps
turnscrews
Parts:
mainsprings (2)
mainspring strain pins (2)
hammers/strikers (2)
hammer pins (2)
First, secure the screwdriver handle in the vise (or clamp it to the bench) with the blade oriented horizontally (this will be used as a lever, so keep the shaft/blade accessible).
Next, place the first mainspring into receiver as shown in photo and keep it in place by installing the mainspring strain pin.
Next, support the receiver upside down on the bench and compress the mainspring far enough for it to clear the hole for the sear spring/cocking bar pin (I used the 1/4" punch to press against the leaf of the spring, but many things could work including your thumb if strong enough).
Insert the 5/32" pin punch through the hole in the receiver for the sear spring/cocking bar pin and seat it into the center block on the receiver (see photo). The mainspring will now be pressing against the pin punch and you're halfway home.
Next, wedge the blade of the clamped driver in between the pin punch and the mainspring and rock the front of the receiver downward so that the driver - acting as a lever - further compresses the mainspring.
Place the hammer into position and with it's through-hole aligned, install the corresponding hammer pin. The 5/32" punch will now fall out.
*NOTE: try not to release pressure on the lever until the hammer pin is screwed down quite far (ideally, all the way - but half a turn shy will be secure enough not to bugger the threads).
Remember that the 5/32" pin punch is a near perfect fit, but 11/64" will probably fit a bit better. I would find the best fit before getting started, just in case a Crass model is a bit different in that way from a Lewis.
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