[Radioroslyn]

Well what will cause that situation is using the wrong size wire or not observing the original spacing of the turns on the coil. I made the asumption that the section of the coil that was rewound is  frequency determining. not so much feedback. This is critical it must be rewound exactly as original. If you are sure this is the case then listen to it another reciever or use a counter to see if the osc is doing what you experiencing. If this is the case then try reversing the the leads from the rewound section. Another thing is you may have a bad mica cap across or in series with frequency determining section of the coil.
Terry