Join Date: Feb 2012
Location: coogee beach australia
Thanked 1,328 Times in 832 Posts
google 'bar end mirrors installation spinning' or similar key
for lots of responses to similar installation problems on
various bikes using different brands/types of mirrors..
always helps in such things to specify brand/type etc..
as a general factor it seems tightening is a factor
[perhaps needing to use a power tool etc]
or perhaps using extra thick rubber or,
reducing the size of oversized rubber
when rubber mounted..
members here would want to know the brand/type
and size of mirrors and installation requirements
and how you did your install etc, to give