All changes to tower
| Date | Change | Source |
|---|---|---|
| 15 Nov 2017 | 1-8: turning added; frame: truss,layout added | Chris Pickford via 00012563 |
| 14 Nov 2017 | 1-8: frameid added; frame info added | David Sloman via e-mail |
| 2 Mar 2007 | Tenor nominal added (G-21c) | Andrew Higson via pNBR |
| 4 Nov 2005 | PN amended (to fortnightly) | John Cater (personal visit) via e-mail |