No jokes please!
Often the moulds we use do not have a suitably flat bottom to
them, making the resulting item wobble when set on a flat surface. There are several ways to create a flat spot in the mould, reaching in to re-set the glass while firing, putting the glass
in at a complimentary angle for a second firing - but they are not always
successful.
Of course, if you have the money you can use a flat lap
or a linisher with a back plate to grind a flat spot on these bowls and other
unstable pieces.
But,
You can still make a flat spot on your piece without
machine tools. Use a piece of float
glass larger than your piece as your grinding base. Put a slurry of 100 grit sand on the base and
put your piece over. Holding it level,
make circular motions with firm downward pressure. In only a few minutes you will have produced
a large enough flat spot to stabilise your piece.
If you do not like the mess of the slurry, fasten a
100-grit sandpaper onto float glass, add water and do the same as you would
with a slurry of grit.
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