here is my research (and personal postings) in repairing the Cushcraft R5/R7 antennas that have been on the workbench!!
R5/R7 coaxial capacitor repair by VE6LB (traps)?
You do NOT need Delrin -- Teflon OR polyetheylene tubing works great (Been there, done that) -- order for Small Parts, Inc.http://www.telusplanet.net/public/telwest/R7/cushcraft_trap.htm
TRY this part number for your RFC (my research)!
DIGI-KEY M8330-ND (mfg. # 5900-471-RC)
Choke, RF Hi current 470 uH 1.2 A
Need the identical black enclosure box used by Cushcraft?
Order that from ESI before they are all gone -- 40 have sold since I posted this link!!http://www.electronicsurplus.com/commerce/catalog/product.jsp?product_id=69167&czuid=1195158651593
Troubleshooting Cushcraft vertical traps (by Ed Hammond - who worked for Cushcraft) http://www.iol.ie/~bravo/Troubleshooting%20Traps.htm
R5/R7 Matching Unit rebuild by G0WCW (photos and parts list) http://www.mrs.bt.co.uk/mrs/r5/
What are those Toroids (L1, T1)?
Use one for the 4:1 balun and
2 stacked on top of each other for the coaxial balun!
R5/R7 vertical maintenance by John Tait, EI7BA http://www.qsl.net/ei7ba/r7_vertical.htm
R5/R7 Repair and Maintenance by A0FRI http://www.xs4all.nl/~pa0fri/Ant/R5/onhr5eng.htm
NEED the Printed Circuit board used inside the box?
I am working on that -- with FAR Circuits.