There are many other WD hitch designs that don't use the right angle round tapered bars, but you shouldn't be having that much difficulty fitting them into the ball mount. Are they lubricated? I realize grease is a bit messy, you could wipe it off and reply each use. Or use a silicone, wax, or graphite dry lube each time.
If they are lubricated and still don't fit easily, are the bars or holes distorted so they are not well matched? if you swap sides do they fit better?
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