.22 Erma Conversion Kit.

Hi all, I've seen a lot of old forums on here about the Erma Erfurt .22 conversion kit. I'm after a good website or book which will help me in my quest for information on the history of the item from citable sources. Why was it developed? Who used it? etc etc.

Any information would greatly help.

Thanks in advance,
Lucas.

Here's a bit on them. Like what they're worth. Erma K98 22 LR Conversion Kit in Wooden Case-Other Firearms Auction Lot-485

More details on another forum... Erma .22 conversion for K-98 - Page 2 - RimfireCentral.com Forums

And another site for anything .22 Miniature-calibre adapters and conversions for Enfield rifles

quite a rare kit in the UK, I had one but sold it to fund my Matchless...... (sold a few other bits too)