Bugged, for the lack of a Hole Saw

Well, my little Amy-tone amp was ready to go, and all I needed to do was put it in it's tin (I had decided to use a cigarette tin for this one - absolutely gorgeous and time-stained it is) and typically something screwed-up.

Oh, the amp worked, and the tin is perfect.
The hot glue was warming nicely -
all I needed was to cut a hole.

But that was fine, and I thought  it wouldn't be a problem
after all I had bought a set of hole saws.

Lovely little toothy things that you put on your drill
cut holes
perfect.

You see I want the speaker to drop into a hole in the top of the tin.
Nowt flash, but neat, if you see what I mean.

But nope - the hole saws I had bought were only for wood and plaster (despite being advertised as 'bi-metal' and fit for purpose, as it were.)

Teach me to trust poxy eBay sellers of dodgy merchandise.

So I've got to get the right one now..

Another week gone

Blahhh.