If you don't know , don't try. Its very easy to get hurt by the spring tension that's on the control arms. Do the first time with an experienced mechanic!
Replace the front upper and lower ball joints.
The 2002 Chevrolet Trailblazer has two different lower ball joints depending on whether it is a 2 or 4WD model. A low quality and budget lower ball joint can run around 5$ wholesale. A premium and preferable OE replacement lower ball joint is around 25$. The AC Delco Professional part# for a 2WD lower is 45D20226 and 45D2104. The labor to replace a single lower ball joint and realignment of the vehicle should cost no more than $200.
Low air pressure, hitting curbs, bad ball joints, bad alignment.
From the dealer approx 89.00 cad, aftermarket ranges from as low as 23.00 depending on the store.
Anemia
Leakage can happen due to low joint articulation. Select ball joint articulation of 50 degree all around. Leakage may happen in the absence of clamping for rubber boot. Select ball joint rubber boot with positive clamping arrangement.
Check the steering arms, the tie rod ends, and the ball joints for wear. Any of these will cause the problem.
Check the entire front end. The tie rod ends or ball joints could be wearing. The tires could be worn or out of balance. And the front end could be out of alignment.
Socket weld joints are an easy and fast method of weld joints. Socket welding is preferred mainly on low pressure joints and small bore joints.
Loose or worn rack and pinion, worn ball joints, warped rotor(s), bent rims, loose lug nuts, CV joints... and the list goes on.Basically, you need to check out the front suspension/drive line/brakes.
Have someone rock the steering wheel back and forth with the weight of the vehicle still on the front wheels. Do not jack up the vehicle to perform this test. Look at the drag link joints, there should be NO play up and down or sideways in the joints. If you are not sure, a garage can diagnose this quickly at a low or no cost.
Ball joint dolls have elastic strund throught their joints, sculpty thought can be baked at such a low temp that many elastics can survive this prossess, also sanding the joints throuroghly would be required, it is possible if you are very skilled but not praticat and dolls over 60cm might break due to their own weight, also invest in elastic type clays such as sculpty moldmaker