In a preferred implementation, a solder alloy consisting essentially of tin 96.5% to silver 3.5% with a melting point of about 221° C. is used to attach disks 10 to {HEAD ~ AGA} 50 at {TAIL ~ solder joints} 55 
In a preferred implementation , a solder alloy consisting essentially of tin 96.5 % to silver 3.5 % with a melting point of about 221 ° C. is used to attach disks 10 to { HEAD ~ AGA } 50 at { TAIL ~ solder joints } 55
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH