carrion4worm wrote:

Hi Barry. May be for the best, as I'm pretty sure those "Thallo" tips would not cover a Billet's 510 nut anyway. There are plenty of tips available with a flared base - for example, the recently released Monarch tips.

As I no longer have a Billet Box or a Bantam Box the best I can do to see if the Thallo drip tips fit or not is give the measurements.

It's 14mm od at the base, 1mm id, 9mm od of the drip tip connector with o-rings, 1.5mm diameter gap between the drip tip connector to the internal diameter of the base.