@ BSA,
I did my morning ride to test the effectiveness of my recent modification to the fender mounting with the use of plastic cable ties to the upper part of the fender instead of the default screw and washer.
The road is slightly wet due to the early morning rain and it suits my testing of the fender.
I am glad to note that the installation is fine.This is a practical solution to my problem of the fender. Its does not rub on to the sidewall of the tyre and the gap is sufficiently big.
It may not suit every Strida users ,but using a thinner plastic cable tie is not un-sightly .It does not affect the aesthetic of my Strida.It is also easier to remove when the time comes.
I think I will stick to this practical solution.