303 hoses and 491 fittings

[Charles67]

When installing 491 fittings on 303 hoses (especially large diameter hoses, i.e.10D), sometimes the hose starts turning together with the nipple/mandrel assembly despite the use of a lot oil, and it becomes impossible to complete the installation of the fitting. This seems to happen more frequently when the socket is not well centered on the hose. Is this the cause of the problem and, if not, what is making the hose turn?
Thanks

 

[Vilhelm]

 

[user 38]

 

[Charles67]

 

[skyboltone]

 

[Skybolt31]

 

[Larry Lyons]

 

[Charles67]

 

[kenamt]

 

[Vic Zubot]