Nice razor. I think i would contact the maker to double check, but you should be able to tighten that by tapping the pins very lightly and many times with a very small hammer or a ver solid table spoon. Lots of little taps, the end of the pin should look like a mushroom and it is the edges of the mushroom head that hold it togethers. So tapping gently all around the outer edge of the pin. So really tiny circles in the tapping. of course the other side needs to be on a solid surface like a metal plate or the tail of a vice.