I tried to start a Dioptra with BS skill of 33 and a Protractor of ql 42. According to the wiki I should have been able to start it at a very low probability. The example they gave was BS skill of 31 and a Protractor of ql 18 with a probability of 6%. It wouldn't let me start it at all, and said the percentage was 0%. This example needs to be updated. Thanks.