This was an interesting repair to a Seiko 7T32 main plate, they're hard plastic.
The yoke spring stud on the plate broke away, therefore there was no spring compression.
I had to drill a small hole through the plate and insert a small diameter piece of metal stud as a fix.
Paper clip to the rescue. I used a small length of thin gauge paper clip for this and secured it with epoxy resin.
The setting lever had to be modified though to allow movement and so as not to interfere with the stud.
Oh what fun.