Tightening loudspeakers screws...

I believe the foam under the driver is to achieve an air seal. Silicone caulk works even better, and holds the driver in place without need for any screws at all. If it becomes necessary to remove the drive this is not too difficult to do using a razor blade.

Here's an interesting video about tightening loudspeaker screws and changing to brass screws. Starring Rick Schultz of Virtual Dynamics.
http://virtualdynamics.ca/the-oddiophile-eps--1/

His reasoning for using brass screws is pure bs. Then again, what do you expect from guys selling the acoustic system resonators?

"I simply stop turning the screwdriver when the screw tells me to."

I didn't know screws could talk.

I haven't tried the brass screws, but the Wheeler Engineering F.A.T. Wrench that Rick recommends is a very useful tool.

I have received a professional the most answer from Matthew James Systems (they are servicing Cello and manufacturing new products with the same philosophy) and this kind of service is the one still building the brand even if it is not any longer in the market(!). They suggest to tighten up the screws every five years and do it by hand just to the point the screws will "tell" you to stop...and they certainly do it(!). Mt to you all and hope this to be useful for everybody.br.dgd