The major changes are that a full rebuild of the coins sensing section to take 1p pieces, also the layout had to be redesigned to the smaller size coins.
Payout is of three of a kind, with smaller prizes for cherries in the right hand window.
Payouts are, 2,4,8,10 & 12, dependent on the fruit in the window. The handle has “feel” to it - a mechanism snaps when the handle is pulled.
The sensing of winning combinations is done by electrical contacts, and connections between reel unit and payout counting mechanism is electrical.
This is a more reliable model and can be confidently left all day to make a profit of 1/5th of takings.