fwiw I think "Johnson bar" is American for what Brits call just a lever. For example the huge reversing lever on steam locomotives was called a Johnson bar. Nothing vulgar about it, rather "Johnson" for the male appendage is a reference to a Johnson bar. Who Johnson was and why he got a bar named after him, I have no idea.
I did once visit a company whose CEO was a grade 1 a$$hole, whose name happened to be Johnson, and who had a big cardboard arrow hanging from the ceiling pointing into his office marked "the big Johnson". That removed all vestige of our already seriously diminished desire to work with with said company.
(I have nothing to say about Mooney gear - the only Mooney I've flown had electric gear with a dinky little wheel-shaped switch).
n5296s