Guessing you know something about quantum theory, but do you also know about welding? You'd likely end up better off just cutting off your existing spindle brackets and welding on new ones from a full spindle assembly like I used. One word of warning.................
MFG's spindles that come welded and ready to install have the spindle arms welded at a 90 degree angle, meaning you can't get any ackermann angle set up to keep the front tires from scrubbing all the time. Other gokart parts suppliers probably do the same thing. Here's an option from BMI that has a 1.75" barrel...............
U-Weld Spindle | 400100 | BMI Karts And Parts ....................and here's an option for a matching pair with 1.5" barrels complete with bearings................
U-Weld Bearing Spindle Kit | 660038 | BMI Karts And Parts ..................I left my spindle arms intact, and welded on some pieces of angle iron and flat bar that tripled the strength of the arms, and got out there so where the hole I drilled for the tierod connection was perfectly in line for zero ackermann angle.
Here's a little bit of suspension that's nice compared to solid...................
Front end spindle with spring for DIY go kart kits. (gopowersports.com)