Just a very quick question, just because I'm curious. On the gearbox you've got the drain plug and the fill plug.

But also, there's a shiney, fairly large plug that looks like it takes a reasonably sized hexaganol key to turn it. What is this, a hole for inspection? Or does it allow you to get to the magnet in the box?

 

cant say i noticed it when i changed my oil ?

 

If you mean on the bellhousing, the wider front part of the gearbox, it is an inspection hole.
To look at the clutch assy.

Magnet?