This is the solution.....
Go to a hardware store and purchase a small tube of Elmer's Wood filler
http://elmers.com/homerepair/product...asp?pCode=E855
Then:
remove the strap button
blow on the hole to remove as much particles as possible and clear out the hole for any particles of wood in there
apply the wood filler in the hole and fill it up the hole
as the filler is drying, try to compact it like a dentist does when he fills up a cavity in a tooth. Use a q tip to push the filler in when it is in the process of drying and apply some more to the hole to make sure it's completely filled up (wait about 20 minutes after you fill the hole to compact it).
let it sit for a day or so
screw in the strap button after it has sit for a day with a screwdriver and tighten it nicely but not too harsh.
let it sit for a day or two.
enjoy.
Jimmy
P.S.: the wood filler only costs about $2.00 here in the US, so it may be relatively inexpensive in New Zealand