[Rez]

With a pinion puller.

"How do you get the pinion off without a pinion puller?"

Is it just me or does that sound like, "How do I get this screw out without a screw driver?" or "How do I drive these nails without a hammer?" or "How do I *^$@ Jenny McArthy without a )$&%?" You need the right tool for the job. You might be able to improvise, but you might also destroy your motor in the process.