Oren formulated the question :
On Thu, 11 Aug 2016 08:27:40 -0400, FromTheRafters
wrote:

The one with straight jagged teeth looks good too, because sometimes
shoulders don't allow for much motion up and down but the sideways
sweeping motion might be just right in that case.

Gator foot model: https://tinyurl.com/j2pr7tu

Nice! Is that a homemade one?