I have posted a video on YouTube of a simple way to keep the spindle on my Laguna Revo 1836. But it will work on most other lathes that do not have a way of keeping the spindle locked.
No drilling involved and it works great. Easier to watch how it works than to try and explain it. Just a few minute job.

Gary

https://www.youtube.com/watch?v=AzExi1D8sak&t=163s