The reamer worked great. I mean you only have to use it to clean up 3 pin positions in cast aluminum, which the tool's harden steel cuts like butter and it's reassuring to know it is absolutely the correct size. I used a sliding "T" handle from my tap & die set to work the tool. I don't recommend using a power tool, it reduces the "feel" and if you are misaligned, you'll definitely do more harm then good. A suggestion to an upgrade for the tool would be to add a hexagonal end to the reamer, which would allow for a wider variety of tools to be able to grip it. This is part of the reason I gave it a four star, plus at thirty dollars... that's 10 bucks a hole... Maybe provide a return program; Charge the $29.99 and keep it if the tool isn't returned or returned damaged but if it is returned, refund maybe $19.99 which is a better bargain for your customers and you get to keep making money on the same tool... just a thought. Service and shipping time with your company has been fantastic!!! Great job!!!