In my words
Upgrade D Hinge Pin Holder PRO-MT 4x4 is a parts-bin item, which is exactly why I keep it in the pit box.
Aluminum is stiff and plastic is forgiving — on a rough track the forgiving part wins.
Stock on small-batch sets moves quickly, so the listing is the honest source for what is left.
What Pro-Line says about it
- Made from 7075 Black Anodized Aluminum
- Nearly Twice as Thick as Stock Holders
- Intended for Extreme Durability
- Maintains Same Exact Geometry as Stock
Questions I get about this set
Do I need special tools?
A hex driver set that actually fits, thread-lock and a bench. Rounded hardware costs more time than any part on this page.
Is it worth doing before I break something?
Usually, yes. A reinforcement part fitted on the bench is cheap; the same part fitted after a DNF costs you a race as well.
