On 3 Mar, 22:41, "Graham." wrote:
What's the best way of locking them in that won't invalidate
your guarantee from the optician?
Why don't they do this for us?
If I don't tighten the screws on my varifocals on a
weekly basis the RH lens drops out!
--
Graham

%Profound_observation%

A blob of clear nail varnish...assuming you've got access to such
stuff.