The sticks on my Vanguard would never get quite that low. About 1 1/4", but perhaps if I took the locking half off they'd have gone lower. My RD6000 was about the same, with the sticks adjusting from about 1 1/4" up to a little over an inch and a half.

Third parties also make different ends to put on the sticks, such as cups for thumbs and balls for thumbs/fingers.