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A little help if possible, ive a pocket watch that has a broken balance, now I’ve identified the movement as it has no markings as an 18s MST Cal.154.

Found the correct staff, Ronda 1811, ordered up a packet from cousins and went to fit bit the balance shoulder is way to small for the balance wheel, also the collet is too big for the staff.

has anyone got the same calibre that they could measure the staff for me please. 
Yes I’ve misplaced the old one so I don’t have a ref to work from unfortunately.

Im thinking the movement has been fitted with a replacement balance in the past hence why the correct staff is too small.

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