i use one of those keychain carabviners everyonce in a while. Usually my Icicle self tends fairly well, especially climbing up, before jamming tighter with body impacts and leveraged higher by hanging at leaned nagle on line (your weight on a non vertical line, leverages tension higher in line, so knots/hitches tighten. Similar eefects of some self tending can be had with a Kut or TK finish under VT braids i think.
Tom i believe has pictured a brass 'dog chain'/hardware snap i think for his tender. On lanyard same, adjustable friction hitch with any kind of tender, even the Dring as mount and tender.