... through the hole in the longer outer blade without restricting its free movement. Regards Tony. Of course.... now you say it that makes total sense. Thanks Tim posted: 28 Nov 2017 07:31 from: Tim Lee I hope some one can help. I have this detail from the trackwork at Monsal Dale station circa 1911. I am trying to work out what the mechanism is that I am looking at within the line of the outer rodding run just beyond the single slip rod and crank position?2999_280223_500000000.jpg Here is a somewhat grainy zoomed in detai2999_281226_490000000.jpg Might it be some form of compensator, or is it something to do with the single slip actuation? does anyone have a clearer picture of this type of mechanism? When I look at the slip rodding what I think I see is the rod locating in the crank before you get to this mechanism and a rectangular bar of sorts connecting from the main rodding run to the crank in front of this- so on the face of it it seems that it is not part of ...