Thanks Gary and Kearn,
Just finished putting some aluminium spacers in over the bolts..(12 x 2 mm tubing) between the mirror cell and the tube and done up very tight..I will give it a test tonight weather permitting. Hopefully I shall see a improvement?
If I still get flexing I shall look at the silicone and see if thats a problem like you mention, Gary. Maybe a little too thick. As I remember it would only be around 1mm thick..
Fingers crossed....
and thanks Guys..