Maplin do a box of 330 m2,m3,m4 nuts and bolts for about a fiver. It is possible to build a reasonable facsimile of the security bolt using one of the longer m3 bolts and a couple of nuts. There is no threadless shoulder, so it does engage the top lever as well as the bottom.

You might want to put a screen protector on the Zumo, because eventually you will drop it face down, and the screen is quite soft. It makes it slightly less sensitive, but with gloves, who's to notice.

The Zumo is quite handy in how it records routes etc. Digging through the operating system of the Zumo, I found the track archives were all .gpx format, which was interesting as they could be viewed using Topofusion ( http://www.topofusion.com/). The free topofusion version is OK but limited. More worrying was that it showed what speed I was doing at the time.

I now use Google Earth (GE). I found a free online service ( http://www.gpsvisualizer.com) which converts .gpx files to .kmz /.kml, which drag and drop onto GE, so I can browse routes by map or satellite overlays, adding in photos where I have them.

Regards

Si