I'm building a two-rail O scale timesaver based on Emrys Hopkin's "Less than Four Square Foot Timesaver" found on Carl Arendt's web site -
Bearing surface - I plan to use a cut down piece of 1 x 4 for the sector plate. The easy approach would be to let the moving end rest on the benchwork 1 x 2 that will be supporting the adjacent homosote yard surface, but I wonder whether wood sliding on wood will provide smooth enough operation of the sector plate, so there is little risk of derailing cars parked on the plate. I'm debating putting a strip of sheet metal or maybe plastic on the fixed 1 x 2 to be a smoother bearing surface, or maybe just wax the wood surfaces. Any advice?
Detent - I want to make sure the sector plate does not slip when aligned to the yard tracks to prevent derailmants, but because the plate will be used frequently while operating, I don't want a cumbersome alignment device like a door latch bolt. Will friction be sufficient, or do I need a detent? I've thought about perhaps recessing a 1/4" steel ball on the bottom of the sector plate so a little protrudes, and let this fit into dimples on the bearing surface at the proper alignment positions. Any better ideas?