+1 on Dan's comment. The small spring yes, large one no way.I don't think that giant spring belongs with it.
That was everything that was in the kit. I do know it takes a 25.64 bit.
Dan That looks like it. But I have never bought a kit from them. I will be in MN in March. I will make a trip there and see if they have that kit.
. The piece is attached to the tranny in his pic.I agree with Ed on the hole sizes! That kit looks to have most of the parts for a cigar pen, but seems as if it's missing the transmission adapter piece--the part that presses into the top of the lower (nib end) barrel, and that spring goes with something else for sure. I would pull up a instructions page from one of the vendors, and you can compare what parts you have.
I agree with Dan and as an FYI, checking the assembly instructions for the linked one does not show the larger spring as part of the kit.