Why the LCA bushing has the hexagon instead of round hole?

[digger]

noise can be an issue, but the inner ball joint is bolted to the subframe and it's also a noise source similar to the proposed rear ball joint altough this one is closer to the cabin. I also think the ball joints with zero plays would not cause a lot of noise.

My Citroen SM has zero rubber joints on all the suspension parts which are either ball joints or roller bearings, and no noticable more road noise than other cars. It's a flying carpet.

it needs to be isolated for NVH to suit their wide purpose use (not a race car) in which case if you are properly isolating it the ball joint you not really benefiting from it being a ball joint hence it is a waste of money

[digger]

Today I filed the hex end into a smooth surface for it to rotate inside the bush, lubed the shaft and bushing with grease for low friction. Will see how long it will last. Done on a 325iT car.

Stock shaft:

Filed shaft:

oh jesus

[sapote]

the ball joint you not really benefiting from it being a ball joint hence it is a waste of money

Longer life than the stock rubber bushing, less work for us.