I've been asked a few times to pin an archtop bridge to prevent movement
and the loss of the intonation point during restringing.
This technique can only be used on laminated top.
A tunematic is recommended to reintonate in case of a string gauge or set-up change.

Marking the bridge placement after the set-up.

Drilling the hole for the dowels. The bit must be small enough not to ruin the threads for the posts.

Dowels installed with white glue. Wood is fine but I prefer teflon pins.

This is the trickiest part of the install.
These 2 holes must be perfectly placed in order for the bridge to seat properly.
This install is tricky and better left up to a pro.