New answers tagged suspension
Given that the Schwinn sidewinder is a Walmart bike, you're best off getting a new bike. We call these BSO's or bike shaped objects. By the time you get a basic suspension fork, you'll be spending more than the bike after installation, whereas you could easily buy a good used entry level front suspension mountain bike (say, a Specialized Hard Rock or Trek ...
First of all, make sure you really have a 1 1/8" fork. Most threaded forks are 1". Remove the top nut on the headset, and measure the outside of the steering tube with vernier calipers - that's the dimension you're interested in. If it is 1 1/8", then yes, absolutely, you can install a threadless fork. You'll need a new headset and new stem. You can re-use ...
Try to gently "tighten" the Allen setting all the way. Then try backing it out. I never hear clicks. I just feel them.
Also, the sram product matrix can be handy (y is cost, x is severity of impacts): source: https://www.sram.com/sites/all/themes/sram_2011/st_rockshox/_images/products/product-matrix.png
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