All changes to tower
| Date | Change | Source |
|---|---|---|
| 25 Oct 2020 | fr1: material amended | John Baldwin via database |
| 1,2,3: frameid amended | Tim Jackson via e-mail | |
| fr1: layout added; fr1A: details added; fr1: mod details deleted | Tim Jackson via e-mail | |
| 28 Sep 2020 | 1-8: turning added; 1,2,4,6-8: canon info added | Ollie Watson via 00014017 |
| 8 Oct 2016 | 1-8: frameid added; frame info added | David Sloman via e-mail |
| 7 Sep 2014 | 1-8: diam,nominal added | Tim Jackson via 00010889 |
| 28 May 2011 | 3: date,founder amended | David Sloman via 00009370 |
| 24 May 2008 | PN info added | SCA 2007 Report via JCB |