I'm having a hard time figuring out if there is an 18mm deployant clasp that would accommodate my double-ridged Hirsch shark-pattern strap. It is 4.25mm thick in the area where I would put the clasp (the whole strap gradually increases in thickness, so it depends on what hole you are using). RHD deployant is 4mm, and Fluco is 3.75mm. I have a 20mm Hadley Roma which is, I think, 3.5mm, so 18mm version would likely be even thinner. Rather than randomly buying other clasps, I'm hoping someone would know of a suitable item.