Quote:
Originally Posted by [1ponders]
There must be something wrong with the compression ring on my NGF-C then 'cos the sbig sags like it's got a rubber crutch. 
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Hmmm..
Do you have a motor on your JMI? I would think if you have a motor on it, the only way it would slip were if the pressure against the tube was far too light such that the tube can slide without the focusing shaft rotating.