I personally like the tighter fit for the purpose of leak issues. I also see your dilemma on personal choice. Also i see what Larzis is saying about pre punched or not. I think your shipping with the diff sizes marked is your best option ATM like you said. If you ship the diff sizes a few times to the same person then when they order again put the option in the order menu. I guess I'm saying the first few orders you send the diff sizes as a courtesy then after that its part of the drop down to order and any others they want will have to be bought. Your
tanks and caps are of great quality at a very good price. And i want to see them continue to stay that way.
Either way you have earned a life time customer. I love your
tanks and really like the slim line of the caps and the fact that you allow personalization at a nominal price No-one could really ask for more from a business.
But i do have a request though and would def be willing to pay a little extra for them. But i would love to see colored o-rings and washers on your
tanks that would so rock and allow a less expensive way for even more customization.