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Helifix DryFix wall ties are power driven directly into both leaves, via a small pilot hole of around 6mm diameter.

Or Helifix RetroTies are driven into a 4.5mm pilot hole in the far leaf, via a clearance hole in the near leaf into which they are bonded with Helifix PolyPlus resin.

Or Helifix ResiTies are resin bonded into a 10mm hole in both leaves.