(starting a new thread on this as the existing ones are now closed).
Is the new bolt (new bolts?) still in at Heptonstall?
I've been away since my last time up there but I'm planning to have a closer look with a view to removing the bolt(s) when I get back home again.
I've not placed or removed bolts before so if there's anyone else local (thinredline20?) has the kit and experience to make a decent job of it please either do it or get in touch and I'll give you a hand.