On Fri, 13 Mar 2020 00:58:44 -0700 (PDT), harry wrote:

On Thursday, 12 March 2020 23:52:31 UTC, Fredxx wrote:
On 12/03/2020 20:06:57, ARW wrote:
On 12/03/2020 19:56, Andy Burns wrote:
https://youtu.be/PXgoGERgL4g?t=337

Any ideas why is he using metal capping?

Why not? It's very good protection against standard or hammer drills.

IME any sort of drill will go straight through metal capping as if it wasn't there.

Well, there is a delay but, more importantly, there's clear warning whne the
drill hits the metal (based on 70 yo capping that's probably thicker than
modern stuff).
--
Peter.
The gods will stay away
whilst religions hold sway