Details of DFS shrinking jaws.

dfsshrinkpatentpic.jpg - scan of diagram of shrinking jaws from british patent 980790
 showing basic layout

dfsshrinktop.jpg - top view of shrinking jaws. Diameter of items shown is 1.75" (44.5mm)

dfsshrinkside.jpg - side view of shrinking jaws. Items intended for use in a fly press 
 hence common 1" (25.4mm) mounting stem