I have a similar issue and Oregonipa pointed me to this post. Lots of good info here but I still have a question - Are the cupped metal pans grannyknot made welded on each side or just held in place by the pressure of the two bushings bolted in? My tension rods were both stuck through the holes with no hardware on the back side and no remnants of metal pan, so I assume not welded. Also I've seen it's advised not to use poly bushings in both positions or the rod can break because not enough flex, so one poly one rubber should be used.