On Friday, September 9, 2016 at 8:35:09 PM UTC-4, JS wrote:
Thanks, JJ. So lubrication is the secret!
Something like LPS1 perhaps?
http://www.lpslabs.com/product-details/560
Unsure if it's available in Britain.
Jim

For gummy bearings I have found that a 1:1 mixture of light oil(3 in 1) and Marvel Mystery oil does a very good job of penetrating and softening up old dry lube. I use a small hypodermic needle to apply it.After operating to work some of the old crap out, lubricate with original type lube.
I don't like any kind of spray lube for the simple reason that it gets all over stuff that it was not intended to get on. Try to do a repair with spray lube crap all over.
FWIW
UH