Kroil is a special oil that penetrates stuck parts and loosens them like no other oil that i have found.
I was trying to find a place to order kroil and hit upon the kano labs website
that has a special
Google Deal Orders 866-487-7245
Google Deal - (2) Aerokroil King Size 13 oz. aerosol cans - $12.00 plus $5.95
shipping and handling. Limit (1) per customer.
I ordered 2 cans at a good price.
the url that shows the offer is at
http://www.kanolabs.com/google/
I have a pfaff 332 that had a stuck das knob assembly and used wd40 for a week with no effect. The Kroil loosened it up with one application - I also sat the machine outside in the SoCal sun for a couple of hours in 100 degree heat that helped.