I have made this TPU shim to install on my build plate and glass cover plate holders. It closes the gap between the holders and the printer to hold the holders more firmly in place.
Can be used with Build Plate Holders:
https://makerworld.com/en/models/485705#profileId-398235
https://makerworld.com/en/models/492155#profileId-405777
and Glass Cover Plate Holder:
https://makerworld.com/en/models/517164#profileId-433439