Howdy fellas, today i tried to create a simple vehicle in roblox studio, everything was ok until i noticed that the vehicle seat did not detect the hinges that were on the wheels, i tried welding them to the vehicle seat wich didn’t work, tried searching on other topics but the only one that seems to be the same problem as mine didn’t work (here’s the link: Hinges refusing to be detected) if anyone can help me i would be very thankful! (no i did not anchor any part of it) 
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Hinges are deprecated
Hey fthegod!
I had the same issue as you did. Not able to find out why the hinges are not detected.
This video should help you fix the issue.
How To Build A Simple Car : Roblox Studio (Outdated) - YouTube
PS: Enable Join Surfaces to auto weld the parts together.
I hope this helps!
Do this instead.
If you follow this tutorial look carefully when you add Cylindrical Constraint.
The way the yellow arrow is pointed at matters. This took me two days to figure this out.
This video shows you the tutorial aswell.