Ball Chain Source

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wb3eii:
Can anybody point me to the correct chain that is used on the band change mechanism for the National Nc-300 receiver?
 I have tried a few different 'new' chains, and I believe the ones currently being made are of a slightly different pitch or size, compared to the remains of the original chains.
 So I'm probably looking for some new-old-stock type of deal, someone who has a reel of this stuff dating from 50 years ago.
 ANYONE?
 --... ...--

Chuck...K1KW:
Hi,

I don't know what the correct chain is but if you know its dimensions try matching them to the many varieties available at McMaster Carr here:

I would think a "standard" size was used even back then!

https://www.mcmaster.com/products/ball-chain/

-Chuck

Carl WA1KPD:
The new ones are all metric. You can substitute, but the drum will not be in alignment on all bands.
Maybe someone has a parts unt?

KD1SH:
  You might check with these guys:
https://www.ballchain.com
  Made in the U.S, apparently, and the sizes they list are given in standard SAE values, not metric, although they do indicate the metric equivalents.

WA2SQQ:
This would make an interesting episode of “How it’s Made”

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