Better than expected
You get what you pay for and for £13 I have NO complaints, had it been £25 I would moan.
It "just fits" it is too small to lock in place and only really does when the Rolleiflex T/s top is closed on the screen, or it falls out. It is 2mm too small all round, however, when shot down it works.
For £13, get one.
If/when you open the top NOT the hood it pops out, but as you wont be doing that unless you clean it there is no peoblem