I've just found out about a new-ish Swann morton product which may be
of great help to us clayers.
It's a metal handle which will take several types of small-size
scalpel blades - the big difference is the fact that the blade will
slide away when not in use - thus protecting it and the owner!
Also, I've found that apart from the three main positions of the
blade (in - out and remove old blade/fit new one) the depth of cut is
infinitely variable and so, it can be used to make partial depth cuts
into soft materials (like clay!)
Here's their craft website...
Most good tool/craft stockists will have them (Axminster does for