BioMax
+1y
There are many different ways to address ball joints, anything eurathane is not a good idea (way too much flex.) If you choose to go with a spherical bearing (heim or uni ball) of some sort, then you can use a 3/4" part. If you want to spend money to feel good, you can use a 7/8" heim with a 3/4" ball, but that's not necessary on a mini (a good idea on a full size tho.) The way that I attach the spherical to the spindle is too weld the misalignment to the spindle. That makes for a solid attachment with little strain on the bolt. If you choose to use a heim joint, stay away from the CM series heims and use the JMX or RCM if you just have to spend money. I haven't found an outlet for low quality uni balls, but I'm sure they are out there so make sure and ask if they are at least JMX quality.
Because I weld the misalignment to the spindle I can use a 1/2" bolt with no worries (more angle from the misalignment) the bolt only does clamping dutys. I still always use at least a grade 8 bolt with a nyloc nut.