All changes to tower
| Date | Change | Source |
|---|---|---|
| 4 Sep 2021 | Work on tenor wheel complete | Paul Mason, JT&Co |
| 9 Jul 2021 | Work started to replace the tenor wheel. | David Potter, JT&Co |
| 24 Feb 2017 | 1-4: nominal added; 5: nominal amended(now: G-34c) | David Kelly via e-mail |
| 5 Dec 2011 | 1-5: frame id added; frame info added | John Baldwin via database |
| 16 Mar 2008 | Tue (by arrangement) PN added | David Floyd (Assn webmaster) via e-mail |