Motor Terminal Box Height Adjustment

I have a problem that the terminal box on the motor is too high, preventing me from placing the motor just where I want it (See Motor Positioning a few posts ago). I bought a diecast box from eBay but it really doesn't fit well - I would have to modify it.
Someone suggested that I cut down the terminal box I have by clamping my angle grinder. Off to Bunnings (large hardware store) for an aluminium cut-off wheel. The orange plastic let me slide the terminal box easily.

The bucket in the background is because the terminal box got VERY hot. I had to dunk it in water after each side. I left the corners slightly intact until the sides were cut through. I made a huge mess - aluminium shards and dust everywhere. (I cleaned it up before taking this photo - sorry!)

 

  

The lid will be too large now so I will get some 2-3mm aluminium sheet and make a new one.

 

 

 

 I will have to fill the old cable entry gland holes with epoxy and drill & tap new holes for the cover (and make a cover) but at least the really messy part is done.