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  • Am I right in thinking that I can use just putty without beading? I’m less concerned about the metal guard - more about having enough space in each frame to hold the much thicker sealed unit in from the back (i.e red line in my diagram) as currently single pane. I guess routing should be possible without taking the door off..

  • Both putty and beading. the only differing factor is mounting the beads to the door face not in the rebate (having the glass almost flush with door will be a bit odd) and the putty to avoid the mm tolerance the tape will need .. potentially the beads could be done in whole vertical strips avoiding a few cuts and joins. . But also can't see why routing wouldn't work , the extra useful bits needed just add up either way

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