All changes to tower
| Date | Change | Source |
|---|---|---|
| 20 Nov 2017 | 3: precise wt supplied | David Sloman via 00012570 |
| 27 Jun 2010 | 1-6: frame id added; frame info added | James Clarke via e-mail |
| 11 Sep 2008 | Precise tenor wt supplied (not ~8cwt) | Chris Pickford (quoting Bell News 1909/p517) via e-mail |