Lighted circle straight drilling aid - GIF

[freddo4]

This idea could be useful for tramming a mini mill.

[BuffaloJohn]

This idea could be useful for tramming a mini mill.

I don't think you would like the accuracy of tramming with this type of tool.

It could certainly be used for quick coarse alignment. But - I think I could eyeball it close enough for coarse alignment that I would skip this tool for tramming.