Well it's possible that you're just a PDR prodigy. If you've gotten good results and haven't spent more than $50 in tools, I suggest you consider PDR as a career choice. The best guys are making well into mid $150k range and they don't work very hard.
I didn't mean to be snarky, but I know what it takes to get even a passable result with PDR, and I think it likely that someone who won't spend over $50 on tools has a comparable amount of time invested in learning the skill.
Me, I tried and failed. I sat under a light at a hood stand for 3-4 hours every night for six months and couldn't get it. I went through many scrap hoods and deck lids. Now just because I couldn't do it doesn't mean that you can't, but guys that do get it to even a hack level put in significant time to get there.
My brother is well known as one of the best in the industry. He started back when there was only a few hundred guys in the US doing PDR, and he's been invited to Germany, Australia, Tangiers and all over North America to ply his craft. I know for a fact he didn't touch anything that wasn't scrap in his first six months.
What you're asking, in my opinion, is akin to asking where you might find a good cheap scalpel because you'd like to try your hand at surgery.
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