Disassemble bolt action pen?

[Woodchipper]

I was upgrading my display today and one had the bolt moved out of position. I could move it but need to disassemble it to tighten the screw in the top section. Tried using my super grip but no dice. Suggestions?

 

[Mortalis]

The screw used to loosen and tighten the bolt in place is accessed through the 'bottom' of the mechanism in all the bolt actions I've made.

Get a small long Philips head and go in through the tube. As far as removing the cap, I'd be very careful and use a pair of plumbers pliers with the tip protectors on. Maybe!