Hello, I just joined to ask if anyone here knew why my two second hand erlprinz's have a different centre pin. Ones a flat head screw driver fit the others an Allen bolt. The seller said one was used once the other was used four times. Pretty sure they're stock but just wondered why they're didferent. I'm imprisoned in the 'hello I'm a newb' thread due to low post count and it's very frustrating I think I'll ask the seller see what he says