All changes to tower
| Date | Change | Source |
|---|---|---|
| 17 Feb 2017 | 1-6: turning,frameid added; 5,6: canon info amended; | David Sloman via 00011990 |
| Frame info added | David Sloman via 00011990 | |
| 10 Aug 2005 | Note not F (nominal added: Eb+33c) | Nick Bowden#55 via e-mail |
| 3 Oct 2004 | Slight change to dedication to match Crockford entry | Graham Nabb check via e-mail |