[TCML] Safety gap

[Binny]

Does anyone on the list know where I can purchase the safety gap hardware as shown in some terry filter set ups.The brass or ss threaded ball gap and adjustable standoffs are what I have been looking for.I have checked the archives and could not find any reference to them. I think they give any coil that professional looking touch.
                                                                      Thanks in advance.    Binny    P.S.  I live in Maine (USA) So a vendor on the east coast would be perfered but any source stateside would be most appreciated...