Water tank key
The water tank lid has always been quite a hassle to
remove every fall when we aimed to empty the tank with a hose and to
clean it afterwards. Using various tools such as a hammer and a piece of
wood, Polygrip etc was both difficult and risky as the plastic could
So, we decided to make a
key for the lid and decided to go with tree and pewter as it was the
things we got in stock at home.
We started by making a plaster copy of the tank lids top but as the
grooves on the lids are vertical it was not easy to get the plaster out
from the lid.
Next step was to buy silicone from the hardware store and use it in the
grooves. In order to make the removal of the silicone easy we used
vaseline as a release agent. this worked quite well and as next step we
used plaster once again to make a positive print of the lids grooves.
After the plaster had dried we poured melted tin in the
cast and had it cooling down for a while. We broke the cast and cleaned
up the pieces of tin. Gave all pieces a number and tested them in the
lid. Of some reason they did not fit immediately but with little bit of
help from a knife, sandpaper and a file for soft metal we got the pieces
Next step was to drill holes in the tin pieces and add short screws, but
log enough so they came out on the other sides few millimeters so they
could be used as markers. The tin pieces was put back in the lid and
then we pressed a piece of wood top of them so we got marks on the wood
from the protruding screws.
The pieces of tin was screwed in the piece of wood, the
lid was put in its place ans we drew a mark around the lid so we knew
where to saw the pice of wood. One again, little bit sandpaper, file etc
and the piece ow wood was done.