ANCIRS 2 Pack 8mm Flange Coupling Connector, Rigid Guide Steel Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors, High Hardness Coupling Connector-Silver. (2 pcs 8mm)

I'm in the process of designing and building a min carousel. My plan is to use one of these flanges to connect an 8mm brass rod serving as a drive shaft to one of the 15" diameter rotating surfaces. The expectation is that the shaft will pass completely through the flange and then be secured with the set screws. However, the flange does not maintain the full 8mm interior diameter all the way through. With about .001" left before the base of the flange is fully drilled through, leaving the diameter of the hole at the base of the flange just shy of the full 8mm width. The brass rod is very cleanly cut, but i just tried an easier alternative to trying to file or redrill the hardened steel flange. I took the rod, pressed the end again the flange hole at the base and forcefully turned it. Whopee. Apparently the end of the shaft was a tiny bit flared at the cut because now the shaft easily pushes through the flange. I'm overjoyed!

The four holes had to be tapped. The rest is good.

I'd buy again in a second.

Worked exactly what I needed it for.

You can just look at the part and know what it does. It does that. And I've had no problems with it. I like it.