Hi, with the positioning of the scollop opening facing rearwards, the clam is locked in place together with the side latches & optional pin bolts on top.
these tongues face rearwards just for that reason to lock, and be removeable by tilting the clam almost vertical. If tongues are facing forwards the clam can simply slide off, but no matter how they are fitted, if you forget to lock down the latches and drive off.... well the clam opens up and breaks off...
you can always drill and tap for a 5/16 or M8 bolt as extra precaution and drill a 1.5 or 2mm hole in caphead bolt and the corner edge of the tongue for safety lockingwire to be fitted.
or fit a locking plate tab on the side facia locking the bobbin/cottonreel in situ.
spacers used to locate the clam, as these GTD bodies fit askew onto the chassis for best fit.
kind regs
morten