[Johnson] Johnson Valiant doorknob cap

[Joe Roth]

   I need to change my doorknob cap (C37) on my Valiant from the current
       500pf value to 1200pf (20Kv). Can someone recommend a source?
                                    TNX
                                  Joe-WC4R
                                www.wc4r.com
                              www.rothweb.net
                           www.williamsburgwx.com