Cut from Cadillac Serviceman 1958 where the following tips regarding how to fix a broken Ashtray release spring in your 1957 or 1958 Cadillac could be found.

This was then actually an approved way of fixing broken release springs when the cars were almost new….

Note that some types of 57 & 58 models have another way of releasing the ash tray. But for you who have this type and it´s broken this could be a neat way of fixing it.