Yep - you're absolutely right on that one. That's the scary part of the job. When you've untaped the glass from the door frame, you gently lower it down, checking through the inspection hole to make sure the glass is going between the guides. Then, when you're sure it's in the right place, you push down on the top of the glass and you'll hear a bang, which tells you either the glass is seated in the carrier, or that the plastic carrier is broken. They can be brittle at this age, so it wouldn't be your fault.
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