Fruit Machine Chat

Hi all, my machine has got upto 50p play on upper glass decal, but won't set to that, it's a oldish machine and so maygay/global making them future proof did this I know but how and what do I need to do now to change that to 50p play, this is my next mission to do this, for people who helped me on the notey loom thankyou I ended up making my own cos finding one was impossible so thanks to them for giving me advice "reelman" thankyou.
so if reprograming is needed please advise.

So any advice would be great.

Nude777