Nice example you found ... so it seems indeed that the bar (pin) stays in position by friction only ... that would be one way to go : to find a pin of the required diameter (to be measured very carefully) and to find by trial and error a diameter that would be maintained by friction .. in that case there is no need to have a screwed head for the pin, as it serves no purpose ! and in addition, you should get MartuLeather (or any other firm similar) to produce a strap with rigid/ stiff head and a hole very tight also .. alternatively, if the ping could have a enlarged screwed head the size of the strap thickness it would be better .. then the friction becomes less important .. in this case also the stiff head of strap is required .. but to find that pin is difficult in my opinion .. the first option is more attainable for a DIY amateur ...
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