Hi All - I have a very old, NOS chuck, Jacob's 100CR (for center rest) keyless chuck
this is from the 70's or early 80s (when they were discontinued)
it has never been used and was left in the wide open position, where it is stuck
i am assuming the grease has turned to varnish?
what is the best thing to soak it in? - i tried mineral spirits, but it won't budge
not knowing exactly how the mechanism is or what is inside, i am hesitant
thanks!
PS: looks like this
![jacobs cr100.jpg jacobs cr100.jpg](https://www.hobby-machinist.com/data/attachments/194/194756-57ad0ba0bfbe230904f9cb59b43197d6.jpg)
this is from the 70's or early 80s (when they were discontinued)
it has never been used and was left in the wide open position, where it is stuck
i am assuming the grease has turned to varnish?
what is the best thing to soak it in? - i tried mineral spirits, but it won't budge
not knowing exactly how the mechanism is or what is inside, i am hesitant
thanks!
PS: looks like this
![jacobs cr100.jpg jacobs cr100.jpg](https://www.hobby-machinist.com/data/attachments/194/194756-57ad0ba0bfbe230904f9cb59b43197d6.jpg)