Installed a Soukup Crafter & Hydraulic Frame & Sash Cramp London Box Specialise in Manufacturing Traditional Sliding Sash Window Replacement Market in the London Area, Please see Twitter entries of this installation https://twitter.com/iwmachines4wood  and U Tube video of machine trenching to Cill Section for the boxes https://www.youtube.com/watch?v=tOEygG5vd4  on their machine.