Potential Issue with Bed levelling process

I have put it on Thingiverse but it’s probably easier to use the link to get to my Google docs.
It’s in a thread about printing on glass that has lots of useful stuff in it. Worth clicking on the first link and having a browse.

https://drive.google.com/drive/folders/1JTZ811Tx-dTD35J4a-u2fsokln20INpR?usp=sharing