John ... it was an American who suggested simply 1/4x20 instead of Whit 1/4x20 so I assumed they had different things over there out of my experince ....I largely have 1/4 Whit or M6x1 which do not mate with each other
Richard ... my thoughts on the 'L' bracket is that it should have two quick release fittings but since I have yet to organise one ... two is way in the future and with OIS and IBIS not so pressing these days .. for me anyway
I made an L bracket for my mini-tripod becuase when held against a wall etc I didn't get a level camera in landscape mode due to limitations of its movement. I made my own ballhead with a large ball, the size of a golfball, becuase that is what I used as my pattern for casting