Whilst this is a photo copy, and some of the pages are a little askew, it was all readable and intact. A real bonus finding an old manual for a classic piece of kit that no other site had.
It was easy done, and I got exactly what I was looking for.
Text excerpt from page 15 (click to view)
Slide the handle to the left and over the central bump on the grill pan. Ensure the handle is correctly located. It is not necessary to remove the grill pan handle during grilling. Place the grill pan on the shelf so that the pan is positioned centrally beneath the grill. To remove the handle, slide the handle to the right and lift the handle away from the cut out on the grill pan.
(NG models only) The grill pan has a removable handle. To insert the handle, press the button on the handle with the thumb and pivot slightly upwards inserting the lip into the widest part of the bracket. Move the handle towards the left, lower into position and release the button. Ensure the handle is properly located. To remove the handle, press the button on the handle with the thumb and pivot the handle slightly upwards and towards the right to remove from the bracket. Protect your hands when removing the grill pan handle. Always remove the grill pan handle during grilling. To check the progress of the food being grilled, the grill pan should be withdrawn on the shelf to attend to food during cooking. 15