Before I started on this troublesome Sessions mantle clock I read through multiple postings on the board about Sessions pallets, strips, entrance and exit drops, etc. Clearly these pose some interesting issues. The clock had not been serviced for 20+ years and had a lot of other issues, but had been running fairly well according to the owners. I had been to their house to repair a pendulum on their GF clock when I saw the old Sessions and asked if it needed service. On the bench in the shop I noticed that the dog bone pivot posts for the verge held the arbor at an angle relative to the plates instead of being perpendicular. There was almost no end shake and it didn't move smoothly, but it would actually run for several hours before stopping. I adjusted the dog bone on one side to get everything lined up, the pendulum amplitude increased a bit, and the clock ran great on the test stand for two days keeping great time. It was difficult to see when assembled, but when I took it apart for service I found the arbor had a curious bend in it of several degrees. I guess the last service person offset the bend by setting the pivot posts at a bit of an angle? The pivot holes had enlarged enough to allow it to keep running - or perhaps had been broached out at an accommodating angle? Anyway - annealed and straightened - bushed and polished -and running great.