Restoration Notes - Pistons On Vintage Kaweco Dia

[RobHarding]

12 hours ago, siamackz said:

Nice pen. Everything looks fine to me from the pics so I cannot quite understand what the issue is. Also, you rarely need to disassemble further from the point you have on these pens, in my experience. Nevertheless, if your questions is about how to remove the pin from the knurled knob, in the past I have tried a few things (a) I don’t know what tools you are using but I use a thumb tac of the appropriate diameter and a small hammer - it’s important to ensure that the knurled part is on flat surface and well secured when doing this (b) if it’s stubborn, I spray wd40 while continuously trying to hammer it gently (from one side then the other), which allows the WD 40 to make its way inside too (c) if it’s still stillborn then I soak that part in WD 40 overnight and try hammer the next day (d) last resort I drill out the pin with a jewellers hand drill 

Thanks for the information! To clarify the knurled knob doesn't turn properly and so the (yellow) plastic threaded shaft doesn't turn either. Thus the piston mechanism doesn't work. I hoped that by taking off the knurled knob I might be able to see the issue more clearly. I had tried WD40 before and a similar thing to a tack to knock out the pin, but it didn't shift and as I have no experience i didn't want to do it blindly, your information and Nethermark's suggestions will be very helpful. I will let you know how things go.