There are of course long and short gearbox trays on Flyers, with the long version used on the long wheelbase machines of late 1926 thru’ to late 1928.
These can be identified at a glance by their sloping front “shoulders” compared to the 90 degrees shoulders on all the later trays. Possibly this is why the clamps were not brazed into position…..to allow the use of both lengths of tray, depending on rear wheel diameter and the radius of the rear mudguard. Hope this helps.
