Heres pic of my echo 24cc.
Basiclly the same size,ect as the zenoah.A clone.
Make yours look like mine.

You can drill out the center of your flywheel with a hole saw,then just attach a prop hub,screwed onto the threads.
Theres lot of pics,and descriptions here in this forum.

Look up the thread entitled,(dont forget echo).
Its a long one,so just weed through the pics and descriptions.
It will take up less of your time.

Anymore questions,just ask here,we all will help when we can.