Originally posted: 29 April 2012 to The Fountain Pen Network
Purpose: For those who want a twist converter for the Kaweco sport. They want this because they do not want to make it an ED, like myself, and don't want to bother with a syringe.
Baoer twist converter (comes with free pen) or similar international converter (not tested)
Empty Kaweco cartridge
Protocol (10-15 min) (see photos)
1. Pull clear bottom half off the Baoer converter. A small twisting motion might help.
2. Trim off about 0.5cm off the top of the empty kaweco cart.
3. Notice that the Clear Baoer plastic part fits into the metal part because it has narrower plastic. Take your knife and carefully make the plastic on the kaweco cart narrower to look like this. Don't trim too much, or you will need glue to hold it in. Mine was snug just with friction.
4. Unless you really trimmed down the clear kaweco converter, your new converter will not fit in the pen. screw converter all the way down to the empty position. Trim an appropriate amount of the top black part off so that the converter fits inside your kaweco pen. If your kaweco is transparent, this is easy. If not, the total length of the modified convert must be no longer than 2.25 inches to fit in the pen. I don't know if the AL sport pens are slightly different. I cut off a little more than half of the top black part.
5. When you ink your converter, the "screw" part of the plunder must not go beyond the black part that you trimmed. This will make it longer than 2.25 inches.
See photos. Experiment was a success. Converter seems to function perfectly normal.
The capacity of the cartridge seems to be the only limitation, as a function of the plunger internal screw length and the size of the pen. The total useful ink capacity seems to have been reduce to 2/3 of the original amount. The plunger internal screw can be trimmed at the top to increase capacity, but I do not recommend this because you may not be able to screw it all the way down without the plunger losing its threaded guide and falling into the ink reservoir. A squeeze bulb could have been used instead of the top of a Baoer converter for greater capacity, but those are harder to find and I did not have one on hand. An eyedropper would have held more ink, but using a converter is a tradeoff for peace of mind regarding leakage. Upon visual inspection, it appears an ED would hold up to 3-4x the ink of this converter. This is an estimation, no volumes were measured.
Edited by mik86, 29 April 2012 - 19:05.