Montblanc 149 + 146 Piston Seals Options:Piston Seal with O-Ring I recommend you get a

I recommend you get a pocket infrared thermometer and use it to monitor the temp of the work piece closely

unscrew the blind cap enough to fit the tool's prongs on top of the slots in the filling unit

FOUNTAIN PEN CAP FOR MONTBLANC 146 IN BLACK

Gold colored nib in Medium

Montblanc 149 + 146 Piston Seals Options:Piston Seal with O-Ring I recommend you get aThese piston seals will fit recent pens by sliding them onto the piston shaft, although ultrasonic cleaning of the original parts and a little heat and patience are required to get things apart and intact. Available with or without a rubber O ring at the top. Note: The seals without the o ring have dimensions of 9. 1 9. 15 mm at the largest diameter. These can be too small for some year's models, so please measure the seal you're intending to replace