Anodized aluminium is not very conductive to electricity, which can lead to string grounding issues. It is quite easy to overcome though, and with recent and future orders, I am including the necessary materials. However, I do not want to make any assumptions on how you would prefer it to work, so I am not grinding off the anodization as described below.
Step 1 – route the ground cable
Drill a hole into the control cavity as usual and run a bare wire through it to the bridge.
Step 2 – grind off anodization
Next, grind off the anodization (using a Dremel for instance) from underneath the base plate.
As well as on top of the base plate. Take care to check an approximate intonation first though. You want to make sure that the area you grind off will be completely covered by the bridge when it is mounted. The ground off portion should sit straight under the saddle.
Step 3 – re-mount with the spring
Lastly, insert the supplied spring into the bridge and re-mount it. The saddle will have full contact with the ground off anodization through the spring, and on to the ground wire that sits under the bridge plate.