No problem all you need do to still use 12mm bolts is
http://www.ramset.co.nz/Product/Detail/83/DynaSet-Drop-in-Anchors
Drill a 16mm hole only 53mm deep in your ribraft and smash these in....
Type: Posts; User: nzfubz
No problem all you need do to still use 12mm bolts is
http://www.ramset.co.nz/Product/Detail/83/DynaSet-Drop-in-Anchors
Drill a 16mm hole only 53mm deep in your ribraft and smash these in....