I was at this site on Sunday and found it quite depressing.
The restoration of the site years ago created a little gem and also a fantastic educational resource. However, subsequent neglect, and possibly an original poor choice of timber or inadequate treatment has now lead to a health and safety hazard.
Although the engine house and other buildings remain good the timberwork has now reached a dangerous state with the outer bob platform visibly sagging. The inside of the two timbers has rotted to the point where a cavity has formed, and it wont be long before it comes crashing down.
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The headframe outer sheers are sliding down off their stools and also quite rotten at this area. Some steel plates were fitted some time ago, on top, and have achieved nothing.
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The metal sheer wheel is badly corroded and a piece of the rim has broken off and is now embedded in rotten timber at the top.
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The balance bob is fortunately in sound condition, no visible rot of the main beam or king or queen pots. However the two timbers that carry the pivot bearing are rotten to the degree that the bearing caps have sunk into the rotten timber leaving the holding down bolts standing proud. One side is worse than the other which has caused a sideways tilt.
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The platforms are beyond saving and would best be removed for safety reasons. The sheer wheel would need to be sounded and the detached section removed. The headframe itself could be saved by adding some vertical support to the outer sheers at their bases, possibly by poured concrete. The balance bob could be jacked up and the bearing timber replaced.
There is a dark shadow over future of this site, especially bearing in mind the current state of local authority funds due to the virus pandemic. A long term solution could be to sell the site to the National Trust for a peppercorn, if they would be prepared to take it over.
My avatar is a poor likeness.