You may want to try abandoning the bottle tips altogether. What is far more effective is to buy large bottles of CA and use the Dave Brown applicators from Tower Here:

http://www3.towerhobbies.com/cgi-bin...?&I=LXB970&P=7

These are keep filled all the time and stored tips up in an old glass as in the picture. The Ca bottle is only opened from the large screw cap to refill the applicators.

These are far easier to work in tight places without the need to lift and position the bottle each time. When the tips of the applicators become contaminated just snip off a bit of the tip. They last a long time and the CA stays fine in the applicators a long time.

John