I've been doing pottery for more than a year now, mainly with smaller forms. Now I'm learning to throw with bigger lumps of clay - 1.5kg to 2.2kg (3.3-4.8 lb).
The problem I'm facing is that the top of a pot goes off center when I'm widening the walls. So I center the clay, open it, pull up the walls to make a cylinder. Then I start to stretch the walls wide from the bottom and at this pointer the top of my pot begins to go off center and the more I widen the walls, the more off center it goes.
I just can't understand what am I doing wrong? The funny thing is doesn't happen all the time. Sometimes the top stays in place when I stretch the walls.
I would be very thankful if someone could watch my video and tell me what I'm doing wrong.
I think I have to mention that I'm a selftought potter, I just watched Simon Leach's videos and did what he did.