String alternative for Eurolab TT

I had the same problem with the knot letting go.What I did to correct it;when you make a loop double it before you tie the knot.Since I did the double loop and then knot I have not had any problems with the knot letting go.As far as string I would contact Hart at Audioadvancements 973-875-8705.Hope that helps...Jofi

i have a micro seiko 1500 where the belt is similar to what you're describing. for years i have used dental floss. use a reef knot to tie it ( left over right and under, then right over left and under) this will never slip. in order to tidy the loose ends. i put a drop of loc-tite adhesive on the knot. let it cure and then you can trim the loose ends flush with the knot. it's worked for me for years now. hope it works for you. it won't cost anything to try it!
.....don

You can use almost any kind of string/line for that purpose. You will find that they sound different, and you can pick one you like. Common strings for TT use are silk bead cord, fishing line, cotton string.