The rear light seals of the RB67 may vary slightly due to age, wear,
generation, etc. To ensure proper fitment of the Frankinstax please note
the following:
Apply light pressure to the rear of the Frankinstax while locking the unit
in place.
If the Frankinstax does not lock to the RB67 loosen the mounting screws
1/8 turn until the Frankinstax locks securely.
If the unit is too loose and light leaks occur, tighten the mounting screws
1/8 of a turn until the Frankinstax is secure.