Do this to improve your pottery bottom :-)
If you often overtrim or undertrim…
If you tend to take your pot of the wheel mid trimming just to check how much you have left to trim…
Do this one thing that will take your worries, your overtrimming and undertrimming away.
Study and memorise the shape of your pot on the inside and repeat that shape on the outside.
For example, if your pot has a straight wall on the inside and curves on the outside, by memorising your inside shape you will gain the confidence to keep trimming until your outside shape is resembling your inside shape, which will guarantee even thickness all around.
Let me know if this helps
