It was about 1.92" long on the long side and had an approx.1/8" hole in the front for a retainer pin that the cocking lever pivot pin went into as a anchor for this spring.
The firing pin strikers are pinned into the frame crosswise and separately.
On the right are the forearm iron assemblies removed from the wood.
On the above picture, the Mono Blocks and rods are different.
You will also notice that this forearm has the later finger grooves on the top edge of the wood.
The bottom illustration is for the type 1 thru type 3 and the Vee springs are buried under the forearm iron and in the wood.