set screw stripped in pinion gear
#4

If it's a 1.5mm and you havent trashed it completely use a imperial 1/16th to get it out and throw it away. (it's 1.59mm)
#7
#9

take a cutting wheel to it.
#10
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If you don't care if you trash the pinion you can carefully cut it off with a dremel. Cut a slot down the whole thing, you'll likely have to cut at an angle \.
Not always easy but it can be done sometimes, might save you a trip to the LHS.
Not always easy but it can be done sometimes, might save you a trip to the LHS.