Product Description
This is an Ealing mounting blank disk. It is threaded for use with components that are outfitted with the 5 inch 12 TPI standard mounting ring as found on their Research Precision Optical Bench. The disk does have a threaded hole in the center (as supplied from Ealing, it would have only had a small pilot countersunk hole). There are also a couple of small counterbored holes in the disk.
The disk is in excellent condition and provided what you wish to mount is larger than one inch, the material is there for customization to your component. Product number is 23-1787.
Location MB 67
Photo set 649