https://www.lfgss.com/comments/9221593/ etc. - 3 years on and still in use with no sign of delamination. More recently I've used the plastic stiffener from the middle of a dead laptop bag which seems about right at 1.1mm thick
Ummmm, posted too soon it seems. ^^That looks work intensive, but excellent.
@Scrabble started
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https://www.lfgss.com/comments/9221593/ etc. - 3 years on and still in use with no sign of delamination.
More recently I've used the plastic stiffener from the middle of a dead laptop bag which seems about right at 1.1mm thick