technical question

[David Bryant]

We have many technical people on this list, so perhaps one of them can help
me with this.

One of the towers which I look after has got 4 of the bells hung on
light-duty ball bearings with open sided housings. The bells are of course
quite light (tenor 5 cwt). Can anyone tell me what the life expectancy of
this type of bearing is? They're not showing any signs of trouble at the
moment, but they don't really look very long-lasting and I don't want any
unexpected problems!

David