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The 5165 will take any 20mm strap - the specific one I use can be sourced at the link below: Sorry but as per forum rules we don't allow links to sales, neither to some websites! Thank you for your understanding. Dje Links to any commercial sites...

hi - very simple - the rubber strap is removed like any strap by compressing the pin that holds it in place (best with a dedicated tool) - need to be a little careful as the stock rubber strap also has two small forward pointing pins (to the head)...