All changes to tower
| Date | Change | Source |
|---|---|---|
| 9 Oct 2014 | frame: material amended | Chris Povey via e-mail |
| 5 Oct 2014 | frame: date amended | Chris Pickford via e-mail |
| 14 Nov 2011 | 1,2,3,5,6: diam added; 4: diam amended | Chris Povey via e-mail |
| 13 May 2009 | 4: diam added from CJP L&J list | John Baldwin via database |