To deploy a capillary string through a wellhead to a downhole safety valve, a control port and a retention port are drilled in an adapter between a casing hanger and a gate valve or elsewhere. Methods of treating polygltamine disorders such as Huntington’s disease, dentorubropallidoluysian atrophy, spinal and bulbar muscular atrophy, and spinocerebellar ataxias with 2-pyrrolidinone derivatives are also descibed. The receiver may include one or more threshold switches that only pass individual or combined magnitude signals when the magnitude signals are above a certain level.