Alternative to Ebonite former for HF Chokes

[SurreyNick]

I want to make a some HF chokes for experimentation in a TRF receiver I am constructing. I have a copy of F.J. Camm's book "Wireless Coils, Chokes and Transformers" which provides detailed instruction on their construction, but I am stumped getting hold of 6-ribbed Ebonite coil former. At the time of printing (1946), it was obviously easy to obtain, being, "6d. per 4-in. length of 1 in. (outside diameter)."

Ebonite was recommended because its properties in keeping self-capacity down to its lowest possible limit. Has anyone successfully substituted something else easily obtainable, or found a source for the ribbed Ebonite?

Thanks

Nick

Almost any modern plastic will out perform ebonite (both electrically and mechanically), acetal is available in black and machines a treat. 10 minutes on a lathe and there you have a former.

[SurreyNick]

Excellent, thanks
Nick

[JHGibson]

Stack alternate large and small diameter faucet/tap washers, held together by a brass bolt through the center holes.
John.

[SurreyNick]

Now that's a clever solution!
Thanks John
Nick

held together by a brass bolt through the center holes

Best not to have a conductor there, stack up on a wooden (or WHY) stick, glue together with your favorite adhesive. Clever solution as said, because I have a lathe (and some acetal) it didn't occur to me.