Well, I found it through a search and I'm sure Beagle did also. Apparently some folks want others to do the legwork for them? Didn't think doing a search was such an ordeal.
Wow, look what a quick search for "walker lever" on this very forum found.
Be sure to look at post #14. It's from me with the same pic as Beagle posted. At least two
members of this forum know how to use the search function.