Thank you 7mmsaum, you were right on the money.
I had a think about it and have just finished making one myself.
Started off seeing if a feeler gauge could handle a sharp bend, which it did not like.
So stole a rubbish cheap 12" rule from the Wifes sewing room and cut it up.
As usual the rule was magnetic so a bit better than plain old commercial grade stainless.
It has worked out brilliantly, so problem has gone away.
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