[Milsurplus] AN/FRT-17 Small roller inductor parts needed

[Nick England]

It is a long shot but I am restoring a Navy shore station transmitter that
uses several odd little roller inductors (1.25" dia) that no longer work
quite right. Maybe you have something like this in your junk box and can
help?
Photos and info at http://www.navy-radio.com/xmtrs/frt17-roller.htm

These roller inductors with sliding contacts were manufactured by Federal,
maybe to get around some patents on the more rational roller-type contact?

Any help greatly appreciated.
cheers,
Nick K4NYW
www.navy-radio.com