The frequency scale on a Sony CRF5090 I bought at an auction was badly warped. With nothing to lose I removed the whole scale, gently ironed it flat but it shrunk, scanned it, enlarged it, took the jpg file to a local printer who printed it onto matt transparency, refitted onto the scale drum and now works perfectly. The whole story is here...
https://www.radiomuseum.org/forum/so...?language_id=5