Anyone know the size of that screw that goes in fill hole? Just got my Pontus and had a clumsy moment when attempting to put screw back in after filling and it danced off my desk never to be seen (in its tinyness) again. I double checked with shop I ordered from and EhPro does not seem to include a replacement screw (as it does with many other attys). I am likely, with my bad hands, to have a repeat occurrence so want to order a small supply of the things...