I recently had a need to use the indexing section on my lathe to drill holes at exact & even spacings.
I did not want to buy an expensive part to do the trick so I came up with a do it yourself simple solution.
I already had a couple of ‘Magswitch Mag Jigs’, see http://www.magswitch.com.au/magjigs/magjigs-2.html
So that was a big starting point.
All I needed was a small piece of 2”X1” scrap pine and some Perspex & one of the Magswitch jigs.
You could use a light metal plate instead of the Perspex but would lose the visibility to the job.
The jig is simply and more importantly it can be adjusted to any location.
I drilled a number of holes in the Perspex of varying sizes to suit different sized drill bits.
If the hole gets too large after continuous use just drill another anywhere.
The tool rest then became the adjustable part up/down/left & right. I can also make minor adjustments by moving the Magswitch.
Because the Magswitch is so powerful there is no need for any other support. It is also easy to remove, just one click.
The result of my first test on a piece of scrap was 8 perfectly aligned holes.
-- Grumpy - "Always look on the bright side of life"- Monty Python