What roller do you have? I’m looking at the Eastwood one and from the reviews it’s the only one worth the cost. They have he best reviews and they will replace the tool within a year from purchase. They also sell replacement parts, which why would you need replacement parts on something like this?!?
All of the different brands say they are only for front fenders. On our cars the front hubs drop so much when jacked up. Would it be acceptable to block up the LCA to replicate the hub at ride height? Of course relying on jack stands.
