All changes to tower
| Date | Change | Source |
|---|---|---|
| 12 Mar 2017 | Ground floor ring | TimJ #223 via e-mail |
| 6 Mar 2017 | Tenor wt is precise not approx | Bowell weight via pNBR |
| 1-4: nominal,turning,frameid added; 1,4: canon info added; | Tim Jackson via 00012031 | |
| fr1,fr1A: details added | Tim Jackson via 00012031 |