While you wait for answers, we may have found some information which could help you.
Click here for Electric Plate HobHinge snapped shut on Bosch ovenHBA138B150B/05?
Bosch Oven Bulb Failure?
bosch ovenHBA13B1.OB bulb cover?
hinge from oven snap shut?
How to remove the fittings to a Bosch light bulb oven?
Bosch oven door - HBN331.2B – Hinge Snap?