On 26/09/2019 14:45, The Natural Philosopher wrote:
On 26/09/2019 14:22, GB wrote:
I have a concealed cistern behind MDF, which has been tiled.
I am fitting a new flush valve in place of the old syphon. It's mostly
done, but I need to recess the button. That needs a 40mm hole through
the tiles and MDF, in place of the existing rather ragged 30-35mm hole.
What's the best way of doing that? 40mm drill will tend to wander. I
have a 1/2" belt sander, but that'll take ages. Any suggestions please?
https://www.permagrit.com/small-rotary-tools/
These willl take down tiles as well as MDF
(wear a mask)
Or
https://www.permagrit.com/radius-ext...e-file-coarse/
Permagrit tools are ruddy brilliant actually
I've ordered one of these:
https://www.amazon.co.uk/dp/B00VSZ1F...740111_TE_item
For under £2 it's worth a go. As long as it does this one hole, that's
good enough.
Apparently, the technique to use is either to make a 40mm hole in some
timber to use as a guide, or to start the drill at an angle, to make a
groove to hold it in place.