On 17/02/2021 15:35, Jimmy Stewart ... wrote:
Just got my first keyless chuck drill and I am having
problems......bought a new bosch 550 wired drill to replace my old black
and decker and Stanley drills and a 20mm masonry drill to open up the
holes in a teracotta airbrick.

Replace the terracotta airbrick with plastic. Terracotta is likely to
to have less than 40% of holes, plastic will have around 95%.

Why are you opening up the holes to 20mm? It sounds like way too big and
if near ground level easy access for rodents.

https://www.screwfix.com/p/terracott...-x-229mm/13873



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