Improve your accuracy when cutting glass, stained glass or large pieces of smalti piastre; grip the tool and gently score a line where you want your cut. Then you can break your material either with score and snap nippers or by giving it a very gentle tap on a hardie. The handle of the scorer is hollow and acts as a reservoir for the oil which keeps the wheel turning freely (use sewing-machine oil which you will be able to source at a number of online retailers).

You should always wear a mask and eye protection when cutting mosaic materials. Unfortunately Mosaic Workshop can't accept returns of cutting tools which turn out not to suit you, so please think carefully before buying.  If you are finding it very hard to make a decision please contact me as I may be able to lend you tools to try (you will pay a deposit, and for postage in both directions).  In the case of faulty goods we will, of course, accept returns - please see notes in the website footer.