Sacs sizes are given as the diameter measured in n/64ths of an inch. Sizing a pen involves measurement of the sac nipple on the section in n/64ths of an inch. This is a starting point, judge sac size based on how it slides in the barrel.
Sacs sizes are given as the diameter measured in n/64ths of an inch. Sizing a pen involves measurement of the sac nipple on the section in n/64ths of an inch. This is a starting point, judge sac size based on how it slides in the barrel.