Luckily, I found a way around damaging the restricted plug, get the customer inside the post office and get the restricted lock back in operating shape immediately after. All that done and without damaging anything except the mortise cylinder. The process that I did started by inserting an uncut key blank in the key-way and then I drilled a 5/32" hole just above the plug and shearline. After drilling through each of the six top pin chambers, I then took out the uncut blank and used a curved pick in order to push the bottom pins down past the shearline, which allowed turning the plug and open the door. Next, I just had to replace the drilled mortise cylinder shell with another shell from the same brand, re-key the lock to a new combination, and call the job a success.
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