I have a 254 in a desk pen base that I actually really like and use semi-often(it's a great wet-writing OB+/OBB- nib that's great for signatures and such).

The only problem is I think someone tried to de-desk-pen it and did a rather ugly hack job on the turning knob. Otherwise, the pen works great, including the piston.

I'd like to replace it with either a proper turning knob(think it would be flat topped with a star) or ideally with a desk pen taper, but I haven't been super successful finding one around.

Does anyone have a damaged/beat up pen with either one of these intact?