I don't cast very often, but a couple of years ago I was asked to do 21 "Class of 2021-22" pens for my grandsons class on leaving school.
I used Glass Cast which I bought from Turners Retreat and did label casting with the school name and logo and added 'class of 2021-22' to the image.
I did them in batches of 4 every 2 days to allow the cast blanks to cure enough to be stable outside the mould before moving to the next mix, and using the blanks after a further 2 days or so to allow them to fully cure before turning.
No pressure pot needed with care avoiding bubbles.
I used Sierra click kits. Here is a photo of some of them[ATTACH]49976[/ATTACH] (sorry about the quality it was just for my own records)
Mike