Digital BW, The Print

For several years, on carts for Canon i860 and i950 printers, I have 
drilled a #36 hole, run a 6-32 tap through it, and installed a 1/8 inch 
Allen head set screw to fill the hole.  When run in to be flush with the 
cart surface, a small piece of masking tap assures an air-tight seal.

After acquiring an Epson 2200 for black and white printing, I purchased 
UT-7 inks and the ARC-2200-EC-SET of transparent carts from MIS for 
refilling.  There are no sealing plugs for the carts (which do have 
sponges).  The initial part of the fill hole is slightly smaller than a 
#22 drill, which for some unknown purpose, necks to a smaller diameter.  
Enlarging the entire hole with a #22 drill permits tapping it for a 
10-32 screw; the hole is long enough that a quarter-inch Allen head 
screw is just accommodated when run in flush.  As with the dye-based 
Canon carts, a small piece of masking tape assures a tight seal.

The sponge in the 2200 carts assures that plastic chips that might arise 
in drilling and tapping do not get to the output orifice.  In the 
several 2200 carts that I have equipped with a set screw, I have looked 
carefully, but been unable to see any loose material in the tank.  When 
the tap is backed out, it seems to carry all the material (cuttings, 
chips, what-have-you) created while tapping the hole.

My experience suggests that this means for sealing cartridge fill holes 
will be satisfactory on spongeless cartridges.

Reinald in Eastern Maine