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Can you get an inspection camera under there to see where it doesn't connect?

They can put a UV dye in with the gas and any leak, however small, can be seen with a black light.

Can they spin just the rim on a wheel balancer to see if it has a balance issue? I've never seen it done, but ...?

Don't throw away your money. They are all rubbish. Do yourself a favour and get some new ones. Its worth it in the end.

Just on $325 a pair delivered (ADR approved) from www.seatsafe.com.au

Easy to fit. The first one took about an hour (working out how it all fit together) and the second one about 15 minutes.

Installed new (aftermarket) front seat belts. Sick of the Nissan belts not retracting properly and getting caught in the door. MUCH better now.

Nothing. Everything on mine works !!!