I've finally found a Biax BL40 for a reasonable price and bought it. But it turns out that the leather strap is torn and close to falling off. Has anyone got a spare one for sale? I'm afraid to ask how much Biax would charge for a new one
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You don't need to buy a new one. I have a roll of leather meant for rifle slings.
Leather machine-tool belting might serve. "Shoemakers" may be an extinct species, but leather arts and crafts, harness and 'tack' shops, auto and furniture upholsterers still exist.
All you need is the material.
Leather is not hard to work with - you aren't hand-tooling a Mexican riding saddle, just a strap. Not a lot of work, it can be made to fit YOU, specifically, and very comfortably so.
Go for leather, Cowboy!
'coz holster, sheaths, and belt makers - not just for firearms - but even carpenter and linesmans harness and toolbelts deal with it, too!
Tough and durable stuff, leather can be.
Holds an entire damned cow together for mebbe 13 years, dairy business. Don't even THINK about the mess we'd have if it was cheap vinyl!
PS: If no cheap sources? Find a mass-produced item that IS cheap and rob it. Got a pair of boots around here as are missing the "tongue". Old pair of shoes in Hong Kong as donated a jaw-protector, channelocks.
Belt as became a leather washer for a French toilet's back outlet, metric to imperial s**t. Literally!
Other scraps pad jaw-teeth on a pipe-wrench when tire-cord or conveyor belting is not handy.