I recently started a new project while the previous one was still being debugged. So, I made a similar mount for the work bench but it too was less than satisfactory. I took a break from clock making and designed and made a clock mount that could be attached to my bench. It was inspired by the engine stands that I used to see in auto repair shops in my teens. It's universal so should be adjustable to fit just about any clock frame. I have an alternate clock mount without the arms, that's 10" x 24" that the clock frame would mount to directly. The clock mount can be locked from just under vertical and swung up to lock just past horizontal and any angle in between. I haven't seen anything like this before. So far, it's just about perfect for my needs.
Below is a ZIP file with the DXF's and a PDF describing the project and some improvements and some additional mounting options.
Email me for the latest DXF's as I have been making some regular changes to improve and simplify them. cnc AT ldrider.ca