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Old 05-30-2003, 02:11 PM   #1
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Default Running-in ball cups?

I got some RPM ball cups today and they are rather tight on my original ball ends. Granted I should go and get new ball ends but I can't be stuffed. Is there any way to get them to be freeer?

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Old 05-30-2003, 02:24 PM   #2
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i think rpm ends work best with associated ballstuds. I had the same problem trying to use losi ballstuds and tried to work them around a little to get them to free up and wound messing them up. Basicly it didnt work, you are probably better off with a little slop than a binding turnbuckle until you can get the right ballstuds.
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Old 05-30-2003, 03:43 PM   #3
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I used the Losi Titanium ball studs with RPM cups, and it binded very little, I would personally like them tight than sloppy, dont want them to pop off too easilly.
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Old 05-30-2003, 05:10 PM   #4
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I'd much rather have them a little tight than sloppy. I went exclusively to RPM ball cups on all my HPI cars to tighten up the steering. Use a little powdered graphite as a lubricant. Works great, won't attract dust like a liquid lubricant will. Be careful not to scratch the balls as this will definately affect how smooth they operate.
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Old 05-30-2003, 05:53 PM   #5
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You can try to gently squeeze the cup where it snaps on to the ball with a pair of needle nose pliers. This will help free them up some, but don't do it too hard or you will develop too much slop.
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Old 05-30-2003, 08:59 PM   #6
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Pop the ball cup on a ball stud and use a rotary tool to spin the stud in the ball cup for a few seconds. It runs-in ball cups very well.
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Old 05-31-2003, 08:56 AM   #7
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yup, use the dremel. if your balls are aluminum, they will be polished in the process too.
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Old 05-31-2003, 05:15 PM   #8
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Thanks for the help.

Nice and free now.
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