Wise chain lock

[candado3]

I have this old wise chain lock that I was not able to open because the outer larger ring was frozen and would not budge no matter what I tried. So I decided to take it apart to see what the problem was. I now have an answer but also a question.

The outer, large ring, was frozen to the housing so firmly that I had to fashion a flat tool that fit into the key slot and hammer it into the slot against the outer ring in order to drive the ring out. It took some hard knocks and I had to force it all the way out in this way. The other outer ring in the other part of the housing is also firmly stuck and won’t budge.

My question is. Does anyone have any suggestions on how I can fre this ring without destroying it or the lock. I would like to salvage the lock and possible hold it together with a screw of some kind. I have tried soaking the lock in penetrating oil, freezing the lock to see if the different metals would contract differently, freezing and then boiling the lock to see if that would loosen the ring but nothing has worked. As you can see from the photos there is very little of the ring protroding so nothing to grasp.

Thanks for any suggestions that you might offer.

[GWiens2001]

You might try some CLR, found in hardware stores. It dissolves Calcium, Lime and Rust (hence the name). Otherwise, I’d get a steel drift punch the same diameter as the ring and drive it down. Once it is broken free, it will be much easier.

Gordon

[candado3]

Thanks for the reply Gordon.
I have CLR but am afraid to try it on this lock as I'm not sure what the metal is that the body is made of and I tried CLR on a Yale bicycle lock of what appears to be a similar metal ad it made a mess of the lock.
If no other suggestions I will try the punch.

[edocdab]

Maybe possible to hook something from under it and pull it? With leverage to pull. Not sure if it's already all the way down.