All changes to tower
| Date | Change | Source |
|---|---|---|
| 25 Jul 2022 | 1: weight, diameter amended | Whitechapel records via David Sloman |
| 22 Aug 2018 | Tenor note (and ring key) amended (nominal: F#-26c) | Dave Kelly tonal analysis via pNBR |
| 1-6: partials added,note amended | David Kelly via e-mail | |
| 2 Nov 2015 | fr1:truss added; layout amended | Philip Denton via e-mail |
| 19 Nov 2011 | fr1: material amended | Chris Pickford via e-mail |
| 2,6: canon info added | John Baldwin via database | |
| 17 Nov 2011 | 1: diam added; 1-6: frameid added; frame info added | John Baldwin via database |
| 31 Oct 2008 | PN info added | David Floyd via e-mail |