Lamms for Hammet loom

I bought an old Hammet loom a year ago that came with no lamms, was only 2 shafts so I've just been using direct tie-up to do rugs but I'm getting ready to add 2 more shafts so want to make lamms for it.   Can any Hammet owners out there tell me the dimensions of a  Hammet lamm or what type of lamm to buy as a replacement?

Thanks

Terrie