gearbox bolts, oddman out

[spyke]

Hi chaps,

On the small square inspection cover on the gearbox am I right in thinking there are three of one sort and one other type of bolt.
If so why? and where does the odd one go.
If this is obvious sorry but I havnt had the pleasure of stripping the box down in the first place I got in a box of bits.

Cheers Spyke.

[muskrat]

G'day Spyke,
                  according to my parts book the odd one goes top right.
Cheers

[trevinoz]

Why?
           The countersunk screw, if I remember correctly, will allow a little more adjustment of the box letting it get closer to the engine late.
                                     Trev.