For my curiosity I have wanted to weigh the three types of extinguishers, those of the kit weight 2 grams, those modified 5 grams and those not lightened 12 grams, in this way the weight is good compromise and i think to have solved the problem.
The rear spokes after a first coat only to verify the color match with the true aluminum, will have now to glue the parts , erase any junction and do the paint job with Testor's exhaust metalizer. I have had the confirmation of the correct affirmation of 935 K3s from a photo taken by the book Brookland's drawn by an article of the magazine R&T (comparison road test) where the three versions have been tested 930 street ,934 group 4 and 935 group 5;some test datum of the Martini group 5 : quarter mile covered in 8.9 sec ,0 -150 Mph in 11.0 sec and a top speed of 180 Mph all this in 1976!