The 950 series
Upper tube 7/16 (11mm)
Lower tube 3/8 (9.5mm)
Outside diameter of the cap .487 (12.5mm)
Outside diameter or the body .425 (11mm)
Number #5 niib, Roller ball , or Roller writer
FP 950 Kits
The Full kits includes a choice of front section styles Nib feed assembly's and Nib. Cap style, Tubes , ink cartridge or Roller Ball refill, Clip, and Bushings. Custom clips cap/finials are available.
Fp 950-B58.4 Kit
Bock Feed assembly for #5 choice of cap styles , front section style and clip.
FP 950-M58.4 Kit
Mieister Nib feed assembly, choice of front section style, cap style and clip