They'd probably be best cut in with a router, which I could set my router table up for - but it's more work.
Ideally I'd like my test to reveal that the least stripped block has stuck fast, that way it's only a lot of work rather than a massive amount to clean all the blocks up.
Brother in law (chippy) sort of agrees with the table planer heating up and melting the bitumen. He suggested trying a joiner as an option. Alternatively try a power Fein tool at low speed using the scraper bit.
They'd probably be best cut in with a router, which I could set my router table up for - but it's more work.
Ideally I'd like my test to reveal that the least stripped block has stuck fast, that way it's only a lot of work rather than a massive amount to clean all the blocks up.