Throttle broke

[Theduke23]

Got my bike running today but this happened to the throttle. Any advise to repair it or replacement parts??

[Scooter4]

Good evening,
I cant tell from your pictures or what you wrote to tell what broke.  Are you able to explain?
I do not know what all type of controls Simplex used, but that sure looks like a Honda spiral control type.
More information will help.
Good luck.
Scooter

[Theduke23]

My handle grip will spin right off the throttle. It works when engaged but o don’t think it should come off

[Scooter4]

Good morning,
you will have to provide pictures of all of the twist grip parts for us to help you.  If I go off of only what I see then it appears that your bike has a 1960's - 70's Honda or maybe some other Japanese bike throttle adapted unless Simplex used that style on later bikes.

Look up pictures of Honda CT70 controls and maybe that will get you going.
Good luck,
Scooter