In one of the experiments I give to my students, they need to set a burning candle at different (fixed) angles. In the past they have taped the candle to a cup and a needle taped to the cup like in the following picture. This is quite inefficient because for the same angle they need to tape and un-tape the candle (to measure its weight etc) a few times and each time they need to measure the angle again. Any suggestions on a better way to do this that doesn't require taping the candle? Perhaps using two poles set at a given distance each with screw eyes on which the candle rests? This way the candle can be slid back and out without having to set the angle again.