Better clip for Kaiser/AP style film developing tanks

The gray clip that came with my developing tank wasn't strong enough to hold the reel while agitating by inversion. The reel moved up and the film wasn't completely covered with the developer.

I designed an improved clip with a lip that slides into groves in the central column and prevents reels from sliding.

My tank doesn't have any branding but I think it's the AP Compact developing tank which I think is the same as Kaiser Universal tank.

Works with 35mm, 120 and 2x 35mm when inverted.