The first step is to mark out the tray (A).
The amount of tray lip to be removed is equal to 2, 3/4 the width of the tray, half of this measurement will be removed on either side of the centre line.
To remove the lip we can use a small hand grinder (B) or a file (C), but care must be taken when using a hand grinder to ensure that the protective equipment is in good condition.
Next we cut down the centre line, care must be taken not to let the tray fall open at this point as it may be damaged (D).
Now use a blunt object to flatten the tray lip at the point where the tray will be bent (E).
Then bend the tray to 90° and bolt the two parts together (F)
Now we measure the distance between the 2 internal edges (G).
This will be the measurement for our gusset.
The gusset is produced by cutting a piece of tray to the required size, removing 1 lip completely and bolting it to the 90° bend (H).
