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• Near the bottom, both outside and inside pressure points must exert about equal pressure directly against each other.
• Use a slow, steady, firm upward motion to pull clay up.
• As you move up gradually change all the pressure to outside only to keep the top as small as possible. 
• This produces a vertical cone shaped cylinder.
• If you get a wobble, lubricate it well with water.  
• Then do a "false raise" without pressure between inside and outside,  but use steady unwavering raising motion to straighten it.
• Sometimes wobbles come from poor wedging.  Part of the clay is softer.