Anyone know what size Allen key is needed for the screws in the bottom of these hipshot tuners? They work loose and rattle so I need to take them out and put a bit of loctite on them. I have both metric and imperial Allen key sets but nothing fits! If not I might be tempted to change them as they’re a bit graunchy in places and I don’t like the shape of the posts as it makes getting a tidy winding tricky.