Back to the VOR method - it has the benefit that you don't need to work out angle between wind and heading, you just look.
You can use the DI, ADF or VOR for this - the advantage of the VOR or ADF is that you can do it before you are on Final.
In this example (it's the only diagram I could quickly find):
- Runway heading 35
- Wind direction 040
- Reported wind 30 knots (little high - I know)
- Cross wind component - the blue arrow comes down around 2/3 of the way from centre to outside of the dial. 2/3 of 30 == 20 knots
The full discussion is at:
Crosswind Approach & Landing
OC619