We all know that the standard tap backnut box spanner wont fit the brass 1/2" backnuts it just slips.
I've got round this problem by hammering down the end into an elongated hex shape, this provides a snug fit for the 1/2" brass nuts (new & old).
Then buy another backnut box spanner for the plastic ones.
I was struggling to remove some old supertaps so I took the spanner outside and hit it on the kerb with a hammer, once the spanner fitted they came off okay.
Just my 2 pence worth.
I've got round this problem by hammering down the end into an elongated hex shape, this provides a snug fit for the 1/2" brass nuts (new & old).
Then buy another backnut box spanner for the plastic ones.
I was struggling to remove some old supertaps so I took the spanner outside and hit it on the kerb with a hammer, once the spanner fitted they came off okay.
Just my 2 pence worth.