Review on Supercrazy Drain Thread Repair SF0041 by Ryan Rodriguez

I've been drilling and tapping with this POS tap and the flat head screw they sent slips without touching the threads. Now I have to take the pan out, weld it on and put it back on the original 18mm. I would replace it, but a new pan costs $650. I checked the tap with calipers and found that the M20x1.5 tap was cut incorrectly at the factory, it's 21.5x1.5, I don't know how that happened.