I started with a HF one for a good while, it will build a few cages, I've since bought a protools that I've used for a lot of years. IMO there are a lot of better options out there now than what I have. When you kill the HF one its real easy to make a bearing holder for the shaft after the bushing gives up, did one for a buddy that was tired of driving over to use mine.
IMO a lot of guys get way to carried away with notch fitment, it needs to fit but seeing daylight that is less than the thickness of the material isn't an issue, I'm sure I'll get flamed for this but weld material is stronger than the tube and in pipe fitting guess what, they gap the every weld so its got weld material all the way through. it needs to fit and it needs to be close but absolutely tight fitting isn't necessary.