Those are the left over parts. :-)
The original owner somehow managed to break the pen blade but also
reshaped it. That was my great-grandpa, died in '54 at the age of 80.
The odd-shaped little parts laying on either end of the double-ended
spring are what I call "dutchmen". They are used to take up the extra
spring width when the blade is thinner than the spring. In this case
the pen blade and the can-opener blade were made from thinner stock
than the springs for space saving reasons.
The old scout knife also had three "cut scales" in it to make extra
space for all the blades. One was re-used as a "cut-center-scale"
between the two springs and one was used as a spacer beside the
spey and sheepsfoot blades.
I re-used the old main blade since it was still in real good shape and
it was a big part of the character of the old knife. :-)
Originally the main (spear) blade was laying in the closed knife at
an angle to avoid hitting the knife's fourth blade, so the blade was
crooked "on purpose". ;-) Before hammering it straight, it needed to be
annealed and so then also, needed re-heat treating. And since I was
changing it to a three-bladed cattle knife, a new single-ended "butt"
spring was needed for the spear blade too. :-)
I wanted to use as many of the original parts as I could, but the
whole point was to get rid of the silly can-opener and bottle-opener
blades and replace them with knife blades. :-) Besides, I can open cans
and bottles with the spey blade. ;-)
Original spear blade. Re-heat treated 1095 at 66+hrc. :-)
Yep, it can scratch glass. :-)
New homemade blades, sheepsfoot to the left and spey to the right.
They are O1 tool steel at 63.5hrc, the more I mess with O1 the less
I like it. :-/ My new favorite is 8670-modified (like L6 tool steel)
from circular saw blades, it can get up there around 66hrc since it
needs to be drawn at a lower temperature than O1 tool steel. :-)
See how the sheepsfoot blade and spey blade are crooked on purpose? :-)
Pocket knife mechanics call those crooked blades "crinked".