I decided to use a piece of scrap lumber as a guide-board which I made sure was very straight to feed the log into the table saw while holding the guide-board against the fence. I fastened the log butt ends to two small perfectly square plywood blocks so that the front edge lined up with the middle of the log, and fastened it with a hinge to the guide board. The width of the two blocks from guide-board to front edge were exactly identical and I set the fence on the table saw so that the blade lined up exactly with the fronts of the blocks. I screwed a board on top of the log to keep the log from dropping in case it was too heavy to safely hold the guide-board against the fence.