The present invention is a mat that drapes over a transom or other barbeque area on a boat. The polarity-reversal protector is to prevent the reverse polarity current from flowing through the connected systems, so that the systems may not be damaged in case of polarity reversal. The second amplifying circuit includes an adjusting circuit which adjusts an output current driving ability and a controlling circuit which controls the adjustment with a predetermined regulation. Preferably, the method also includes the steps of archiving attachments from the attachment databases under defined conditions, and providing attachment database indexes to keep track of the attachments in the attachment databases. This nonsymmetrical spring biasing may be provided by a torsion spring with a central coil wrapped around the idler shaft and extending legs anchored in nonsymmetrical anchoring positions andor with nonsymmetrically shaped legs.