just puled the headlight of bike, lens was stuck pretty good but managed to prize it of
the glue has weathered when taking it of the lens it just broke up brittle, some good ideas in that link you posted donsy maybe going to rough up the plastic channel on housing with sand paper emery cloth for something the glue can adhere to .
just finished the job drilled a couple of holes in that channel rough up the whole channel with sand paper to get more adhesion put a good bead of silicon adhesive in channel popped glass back in pushing it in firmly
then raped duck tape around headlight to keep it in place leave to dry 24 hr job done next the fuel fittings getting rid of thoughts plastic ones .
Well I nearly missed it just wishing Sophia my 910S BRUTALE
A happy birthday built in early 2005 purchased in Feb 2006 ive had her 15 yrs , 13 absolute wonderfull yrs
Still haven't ridden her much in the past yr feeling guilty