Joined: Jun 2012
Posts: 1,881
Likes: 188
From: Colorado
Bikes: '91 Mtn Tek Vertical, '74 Raleigh Sports, '72 Raleigh Twenty, '84 Univega Gran Turismo, '09 Surly Karate Monkey, '92 Burley Rock-n-Roll, '86 Miyata 310, '76 Raleigh Shopper
Dunno about the HG 7sp cassettes, but there were a couple different threaded freewheels offered. One appeared much like the photo you posted, but the one I wound up using had a 34-tooth granny gear for touring, instead of a 28-tooth low gear. There was a pretty fair jump from the 34t cog to the one below it, but it seems to shift okay. It wouldn't surprise me to learn that there's similar HG cassettes available.