Why???

[grog]

I bought new bar end mirrors, same chinesium ive bought over 10 yrs. Only replace as chrome bits rust & paint gets daggy, just age.Fitted and rh glass vibrates, first in about 5 sets. I swapped them side to side, now both perfect. WTF.Good result but i dont understand 🤷

[Pommeroy]

I bought new bar end mirrors, same chinesium ive bought over 10 yrs. Only replace as chrome bits rust & paint gets daggy, just age.Fitted and rh glass vibrates, first in about 5 sets. I swapped them side to side, now both perfect. WTF.Good result but i dont understand 🤷

[Pommeroy]

I bought new bar end mirrors, same chinesium ive bought over 10 yrs. Only replace as chrome bits rust & paint gets daggy, just age.Fitted and rh glass vibrates, first in about 5 sets. I swapped them side to side, now both perfect. WTF.Good result but i dont understand 🤷

Clicked post too quickly!

I think the answer is obvious...moving from right of centre to left of centre has had a stabilising influence!