Drag sprite through a specific area

Hi all,

I'm looking to create a very simple 2D gear stick which is draggable into the correct gear positions (1, 2, 3, 4 and 5). Here is an image of what I mean:

Gear 1 - https://imgur.com/GmcIvf1
Gear 2 - https://imgur.com/Fj3KD4W
Gear 3 - https://imgur.com/q5zlhbf

etc.

I have a script which allows the red 'gear stick' to be draggable, however I don't know how to keep it within the bounds of the gear guide (the grey lines).

I've tried using collision boxes but can't get the red gear stick to stay within the bounds. I understand the logic is to lock the X axis until the stick reaches the junction, and then release the Y axis but this didn't work well for me.

Many thanks,
Farid

 

There's no need to double post, please.