Building Blocks S/Force Pullback Func

Description

1. Are you looking for a specific brand or set of building blocks that have a pullback function? If so, could you please provide the brand name, set name, or any other details you remember?
2. Are you interested in how pullback functions work in general, and how they might be applied to building blocks? If so, I can give you some information about the mechanics of pullback motors and how they can be used to create movement in toys and models.
3. Are you looking for building blocks that can be used to create vehicles or other objects with pullback functionality? If so, I can suggest some sets or brands that might be a good fit