Here is a drawing of a restrictor that i've made today for my Optimus-535 and Radius-10 to convert this stoves to run it on benzine. Matherial is brass or stainless steel. No needs to change the jets. I am brewing clean benzine (white gas) from regular automobile 92nd by destillation, 60-120 Celsium degs boiling (there was a thread earlier). And it is a twice cheaper.