I noticed Saturday night that one of my tuners wasn't holding tune very well. I then noticed the flat head screw that holds the cog on was missing. I found a M5 metric screw at the ACE hardware the next morning which is holding for now, but I'm wondering where I might find a replacement? I found these at Upton, but that's all my google-fu has been able to turn up so far and these don't look the same nor do they say if they're 5mm. http://www.uptonbass.com/rubner-tuning-machine-replacement-screw/ I emailed the US distributor for Shen basses, but I'm not holding my breath... Any ideas where I might find one? Thanks.