I occasionally sell a few pens through an out of state shop and received an email today that a customer brought a pen back to the shop because the customer couldn’t “get it to twist” (Executive style pen). The shop owner now has the pen and wants to send it back to me. I checked my records and this pen was sold in June 2017. So my question to some of you more seasoned folks is how long do you guarantee that a pen will work once it leaves your shop? Every pen that leaves my bench works at the time I make it and at the time it leaves my shop, but I’m curious as to how you all address this. I appreciate your insights and thanks!