http://www.ebay.co.uk/itm/OIL-RESISTANT-NITRILE-RUBBER-SHEET-Various-sizes-thicknesses-1mm-2mm-3mm-/182296610369?var=&hash=item2a71b98641:m:mNtiat_qmLl9FENa9zSQXDw
A4 sheet of 2mm thick rubber. £3.89 posted = front and back flaps
will it be stiff enough?
chuckles
I used some soft-ish 3mm rubber and it's worked fine. It isn't rigid, but it doesn't need to be - just account for it drooping when you cut it. Certainly a lot cheaper than one of the RAW ones!
@amey started
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http://www.ebay.co.uk/itm/OIL-RESISTANT-NITRILE-RUBBER-SHEET-Various-sizes-thicknesses-1mm-2mm-3mm-/182296610369?var=&hash=item2a71b98641:m:mNtiat_qmLl9FENa9zSQXDw
A4 sheet of 2mm thick rubber. £3.89 posted = front and back flaps