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Bob F

dadiOH wrote:
wrote:
I'm trying to put a fan into a 12-inch thick brick wall. Diameter is
about 8 inches. Naturally I don't have an 8 inch masonry bit (and I
wouldn't like to pay the cost) so the next best thing is to cut
through enough bricks to make a squarish hole though which the fan
will fit. But that leaves small gaps on each side which I'd like to
fill in with mortar. I should also mention that I can only get to the
inside; the fan (really the vent part) is lowered from a higher floor
using a string duct-taped in place. When it's where I want it one
strong tug and it's free. So I have to push the mortar in from the
inside and it's a pain in the butt. Push as far as possible using
hands and then use a dowel to push it all the way and hopefully
compact it.

Well there's actually a miniature tool that I could use to do the
job. You know when you have a filling at the dentist: he does his
drilling and then uses a thing that looks like a tube with a piston
inside to place the amalgam in the cavity. He then tamps the amalgam
down with another instrument.

Upsize that tube with a piston to 1/2 inch (or maybe have a range of
sizes from 1/2 to 2 inches), pack it with mortar and then push the
piston home to place the mortar deep into the hole. Now where can I
get such a tool?

PVC pipe and a dowel. If dowel is too big - or you are using a big
diameter of pipe - whittle down a piece of wood. Good luck with
packing mortar into a 1/2" diameter tube. There are also grout bags,
look like a cake icing bag. I bought one once, tried it once, threw
it away.

And then there are grout pumps.
http://www.ebay.com/itm/Grout-Pump-M...item5198171850