Ok I'm very confused.
I thought I understood how to measure pen sac sizes for a pen and the dimensions of the sac to use for the pen once it is measured.
1. To figure out what sac to use measure the Outside Diameter of the section nipple and convert to 64s of an inch. For example, a nipple that has a OD of 1/4" should take a # 16 sac.
2. I have read that the OD of the #16 sac should also be 1/4 inch.
However, I just received 4 #16 sacs from a supplier and their ODs are noticeably smaller than 1/4 inches. More like 7/32. (i.e. 14/64). Did they send the wrong size, or is there supposed to be some stretch.
I will add a picture from my phone in a reply.