I remember that the carbon lost the conduction after a time and there was a carbon spray laquer, conductive, to be applied. As I also remember, the carbon in SDX was not flat at the bottom, it stood on little legs to create a small space between coil/foil and itself. This means: The "switch" was open until the hit of the stick came.
If these small dots were damaged, the unit had something like a shortcut and had to be replaced.
Examine the underside of the carbon: How does it look like? If there are wrinkles, it is broken and causing shortcut. Are these "feet" ok or flat?
Yours
Michael
----- Original Message -----
From: José Duarte Antunes
To: Simmons_Drums@yahoogroups.com
Sent: Sunday, May 13, 2012 11:15 PM
Subject: Re: [Simmons Drums] sillicon mallet
Thank you for your advice. That part has been done. I`ve traced back all missing connections with a conductive pen.
Now I`m striving for perfection. Any advice on restoring the upper carbon part to full performance?
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]