I thought I had bought one once but I was wrong. It was advertised as a genuine Blumels pre war item but when it arrived it was plastic and steel. I now use a genuine WD issue pump
that was probably made for a BSA M20 (?) Perfect fit and correct stirrup. A generous coat of paint covered up the WD arrow marks so nobody except me (and now you) knows it is
"wrong". I know you won't tell the concourse judges.