Mini adjustable stand

I came across a small problem - some tiles needed replacing at ground level but about 15 to 20mm from the ground. There was a pipe in the way, so placement was difficult - these tiny stands can be used to hold the tiles in place for fitting by adjusting the height - once adjusted, the tiles can be cemented in place and the stands prevent them from dropping.
The screws need a bit of help from pliers or grips for the first insertion but then are OK.
For my situation these small stands work but are a bit fiddly - I made a strip called separator.stl to hold them steady and at a fixed distance apart