OO/HO TRACK PENCIL HOLDER MKII

I could not help myself when I made the previous version I was thinking of doing this, but took the easy way out, and because of the interest in the MKI http://www.thingiverse.com/thing:2025266, here is the MKII.

The number of times I have had to trace along a piece of track to mark out where I want to lay the underlay, or marking out the curved form-work to lay the track.

Of course one does not have a set of radius curves of every size so this simple device joined up with the OO/HO FLEXI