... key is then driven through the slot in the pin to secure it, and pull the taper tight into the collar. Sometimes the pin has an extended head which runs through holes in the stock rail. This ensures that the switch blades are held down onto the slide chairs and unable to kick up under traffic. The leading stretcher bar would usually have a lug or collar forged into the lower part to which the drive connections would be attached. That's not shown on the bar drawing, and only sketched on the plan: 2_041124_540000000.png The full scan of that plan is here: gallery/2 /original/2_191726_470000001.jpg regards, Martin. posted: 4 Feb 2016 16:46 from: Tim Lee Martin, Thanks a hundred times.... this is fantastic. Now the head scratching starts (as no doubt it has done of many before me!) However I was encouraged by Chris Gough's efforts on Cadhay sidings... so perhaps there is hope. I note there is no switch anchor on the drawing? Regards Tim posted: ...