Here is the link to eBay seller for the gig bag. So long ago that I thought it was bought on Amazon.... https://www.ebay.com.au/itm/20mm-Gig...REXK:rk:1:pf:0
Pilot holes for the tuners are very small indeed. Best to line up a screw with intended drill bit to make sure that centre core of screw is same or similar thickness to the drill bit about to be used.