there is a picture of the rear of the Visionette receiver at
https://www.earlytelevision.org/western_pics.html
There is another picture of the receiver components taken out at the top of page 13 on this pdf
https://www.californiahistoricalradi...ing-Summer.pdf
I think the Western Junior camera may have had the 4 triangle shaped brackets merely to be more rugged in a commercial TV studio setting. The design of the Visionette receiver would also make taking the 17 inch disc easier to get off. I had to remove the outer two brackets of my eBay purchase in order to get the disc off. The other possibility is that these 4 brackets are off two Visionette receivers. This mechanism may have been part of Dr Taylor's (Author of Taylorvision book). A separate auction by the same seller had Dr Taylor's mechanical receiver he had built for sale. The camera had two large photocell boxes (separate pieces) and a light source (arc lamp?) to project light through the disc for the flying spot camera. The Visionette receiver had a traditional receiver neon lamp.
Attacted picture is the extra stuff lacking from a Visionette receiver (behind the Disc where the Visionette has a straight bar. )