How can i tie a permanent knot in a knecklace with a waxed thread?

I have a Maori bone necklace and i wish to wear it permanently, I've tried using a reef knot but because the cord is waxed this doesn't hold and the knot slips out is there another solution?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).