I have a TT910 with window mount - original mount had no adjustable mount and was prone to coming adrift - now have an 'adjustable' mount and no problems
However this leaves a 'tell tale mark/ring' when demounted for security purposes
Just noticed ad in Sunday Mags for this device
Southmid Products LLP | Welcome to Southmid Products LLP | Overview
claims to provide secure mounting and also eliminates the 'tell tale mark/ring'
PZU - Out OF africa (retired)