well fitting sliding brass bobbins to 'remember' whatever dimension,
actually a handy device in my own place for 'centring' all my die-cut
packaging; spawned wheel marking gauges to follow. Heat blued nicely
turned steel locking screws onto 3/16 dia stainless rod 5-3/4 inch (ie
146mm) overall. I first offered this in the mid/late 1980's and as with
the plumb bob was one of those items discontinued because of being busy
with tooling for electronic circuit board tooling, with hindsight I
should have kept these items in production, other firms picked up the
ideas and called them their own!
Memory Stick no longer available.