Skip would know...
When I first told Skip about my find/purchase I sent him a couple of pics of the stylus brush. Just for him to turn round and say that his dads got one?
The idea is that the second hole will be added as per ref pics, I'm in discussions with Mitchells to ask if there has been some design evolution or scrapped parts etc to try and determine the second.
'thoughts' are that they added the second to the prop so that it neither slid up or down against the other, or revolved. looks to be held with a bronze piece.