If there's no change in height you could glue a 1mm strip of stainless / brass etc down over the gap for a very thin threshold. Metals4u cut to size
I saw some alu strips on ebay too that might work. Will need to measure the gap. Ta
@hippy started
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If there's no change in height you could glue a 1mm strip of stainless / brass etc down over the gap for a very thin threshold. Metals4u cut to size