Is it a 007 movement? The issue would be if you bought a caseback tool that the dial (if dotsnot straight) is obviously not attached to the movement (by dial feet) - so I'd bet it's attached (or not ) by dial
That said- if your confident there are lots of new 007 dials on eBay (sold by modders) for around £10.
If you want to practice I have a used 007 dial in my parts box