temp grounding

[rock12]

I am setting up the test run on my simple SE and have mounted my bright blue edcors on a piece off wood. can I ground to the bolts that hold the bells or do I have to grind paint and ground at the bottum attachments. My final setup will have these mounted on an aluminum plate. I am using a large star gound that will be bought to my power ground

 

[kkcinc]

Grind the paint.

 

[rock12]

thanks