Worm driven mounts will soon be a thing of the past, being replaced by direct drive technologies with high precision encoders performing read outs a hundred times a second. This technology has no periodic error or backlash. I noticed this trend at last years
AIC conference where Chronos and ASA showed their wares... Unfortunately, these mounts are still quite expensive though this will change with time. It would not surprise me in the slightest that the Bisque brothers have something going on behind the scenes with this technology.