Basically it seems OK but I think at some point I got the chain jammed in the mech and it tweaked the cage plates a little but they should be able to be bent back with careful work, although tis not so out of shape it's unusable.(see pics to make your own mind up).
Anyone for £35 since it may need some tweaking?
all the pivots seem to be OK and the spring is still strong.
Dont have shims so will fit 34.9 as it is but if you can shim it will fit smaller frames. Bolt can be moved to other end of arm so will do top or bottom pull.
Also found this:
which is the remains of another rear, Frame bolt and spring assembly missing but could be useful for pivot/circlip and linkage spares so will swap for chocolate bars to the value of postage