Thanks. Slides for keyboards trays worked well for this, there's a detent that holds the slide in the extended position- https://www.accuride.com/en-us/products/3832edo-ie.
A few wooden battens on the side of the vacuum frame work as a kick stand to hold the frame open when loading. There's a write-up of the project here-http://colinflanarygraham.com/darkshop/?p=337
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