How To Disassemble An Osmia Button Filler?

[OMASsimo]

I currently have a 1930s Osmia 222 button filler on my work desk which needs a new sac. The barrel is celluloid and the section seems to be hard rubber. It's a rare pen and I need to be extra careful. What I don't know is whether the section is screwed in or only friction fit. Does anyone here have experience with button fillers from Osmia? Any info is highly appreciated.

[OMASsimo]

Is there really nobody here to ever disassemble an Osmia button filler? They weren't that rare - or am I mistaken?

[davidkmp]

Hello I now own the blue Osmia fountain pen that you commented on recently, suggesting it is a 223. I see that you have disassembled your Osmia, could you please tell me if the thread is left or right handed as I need to replace the sac. 

  Thankyou David.

[Nethermark]

It's right handed.

 

It's good practice to apply dry heat (hairdryer) to the barrel, where the section is attached. This will loosen the bond between the two and make the barrel less prone to cracking. But only heat so much, otherwise you can damage the pen.