On Saturday, 3 March 2018 13:25:50 UTC, RJH wrote:
It's fine, but a bit flimsy - the cover could pop off quite easily. And
possibly 60mm would do it.

You can get them in solid metal eg

https://www.midselec.co.uk/tass-80mm...k-grommet.html

https://www.alldoorhandles.com/Carli...able-Tidy.html

Owain