I develop 8 x 20s and 18 x 22s in trays. By inspection.

I use a NuArc frame. I bought it for the 18x22s. Before then I had an old spring back contact printing frame for my 8x20s. I have tested and there is no difference in sharpness between the NuArc and the contact printing frame. BUt the NuArc is so much quicker. I'd use it if I made 4x5 contact prints. And I had an OLD frame made out of very dense wood and the springs are strong.

For bulb and allother things Azo see my articles at http://www.michaelandpaula.com, but you probably knew that already.