Guys how much do you torque the prop nuts on the 170 ? I pretty much go as tight as I can without having smoke come off the nut and this had work fine until the last contest where the prop had loosened inflight and had to abort the round. The spinner backplate showed signs of wear just like the trust washer did. Maybe I should go even tighter and for that I ordered an extra long 13mm Snapon box wrench;hopefully this will help. One thing I've noticed is that the YS trust washer has grooves machined in the front face where it contacts the spinner back plate but I don't think they work at all because they do not match the groove pattern in the spinner backplate. Any ideas-suggestions ???