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The paddles I've created differ slightly from the design that I Remixed. These paddles use bearings for less friction, and the return tension is created with magnets instead of a spring. 

I have uploaded a PDF with step by step instructions. I also have a video of the assembly of Johnathan Kayne's key, and there are only a few differences between his key and mine, so that video might be a great start. https://youtu.be/_VcoATJpCOs

# Per Assy       Short Description
2                       Magnets
1                        TRS jack
1                        Standoff M3x10mm Female Thread Brass Hex
2                       M3x20 screw
2                       M3x16 screw
2                       M3x10 screw
6                       M3x8 screw
1                        M3x4 screw
3                       M3 solder tab
6                       M3 nut
2                       M3 washer
4                       3x8x4mm bearing
6"                      hookup wire 3x2" each

All of these parts can be found on Amazon. The links provided in the part list are Amazon Affiliate links. Using these links to make a purchase does not cost you extra, but I receive a tiny commission that goes to help me create.

The expensive part is buying all of these items! On my website http://w1rcp.com I sell kits for this reason. I buy in bulk and repackage them for each kit. 

You can print the parts in PLA, but don't leave it where it gets hot or even warm because the parts will warp. I print mine using PETG, and so far I haven't had any trouble. As of this posting, it hasn't been a hot Summer day yet, but I have left one in the Jeep for weeks without any change in performance using PETG.