The Four harness extension can be added to the Louet Spring II Floor Loom, for a maximum of up to 12 total harnesses.
Today’s Spring loom is supplied with 8 or 12 shafts.
With this extension of 4 shafts and 4 treadles you can turn an 8-shaft Spring into a 12-shaft loom.
Please note that heddles are not included with the extension.
The Spring II Floor Loom sold separately here.