Watreman's Ideal 42 safety pen repair need .

I have a waterman Ideal 42 safety pen which needs repair and replacement of the sealing.
Any advise and all your expertise suggestions are Welcomed. and I thank you all for. in advance.

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I have disassembled cleaned and polished the pen.It looks very shiney and all century dirty layers are gone all I need now a new seals/ O-rings to fill the pen.

I have a second challenge with another Italian Safety pen. Unknown pen ( no name ) it looks bigger than my Waterman and again a solid pen.

I disassembled the pen and cleaned again. This pen has a very mysterious way to replace /take the sealing washers. No visible pin to tap off to remove the Turning knob.


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Honestly, do not do this for pens you do not own. So many variables and you will break pens, can you make the pen part you break ? do you have the spares to replace the broken part ? This will happen in the learning process of these pens. Waterman safety pens are the easiest to service, but if you do not have the correct bespoke tools or knowledge, you'll break them.
I've done a few Penn and Teller type articles on pen repair works, for the Writing Equipment Society Journal. You've just given me an idea for another one. They tend to be, show me like I'm a five year old and picture heavy.

Thank you Eric, for your kind advise .
Yes I can see how i had been very careless and been lucky not to get destroyed the pen. I really agree no one should ever try to go into to learning process with these type of pens.
I'll be in touch with you soon when I am ready to get this pen fixed and there are few more pens too need restoring. So I am waiting to do a financial plan to put every thing together to get your help'.
Thank you for the PM you sent me previously.
Thank you Eric. and I am Based in London.