Flip it over and go through the back - the grinder basically wants to cut straight lines.
If you have access to a mitre saw, a multi blade would do that nicely.
Was definitely going to turn over, maybe cut a jig in MDF with straight edge to work with the jigsaw.
If the first one is rough, I could just take it super slow with a hacksaw.
Mitre saw would be first choice. I've cut a bit of aluminium before with mitre or table saw and it's perfect, very fine finish, less trouble than oak generally.
Bring it round my gaff
@Acliff started
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Flip it over and go through the back - the grinder basically wants to cut straight lines.
If you have access to a mitre saw, a multi blade would do that nicely.