A friend is asking if I know anyone that can restore a slip joint Cock of the Walk folder. It's her son's that was given to him by his grandfather, so he's really attached to it. Apparently he lost it outdoors but subsequently found it. She says one of the blades doesn't exactly lock. Not sure what than means since it's not a locking blade but there could be some spring damage. Do any of you guys know a person who could help her?