Fantastic Ad on the Release date Unkie. As well as the date this would have to be one of the most informative Victa Ads of any model Ive seen.
As for the Spanner bar. Id also never considered this,But then Ive never really gone into toe rings in this much depth until now. The suggestion you were given seems to be.....Well,Perfectly logical! Now go and hug your Suggester! lmao.

Now going back to the front Flap...Im really having a hard time getting this throttle through the height adjust idea.While I wont discount any Idea put here,I just dont see it:) Firstly the height adjust knob runs on a soild bar....yes the connecting rod is hollow but if a cable ran through from front to rear,where does it actually come in at? There are no connections to the carby to be seen either...It could run under the base from the carby and up through the axle housings and out to the front flap...But Seriously? melted and chopped cables. It must have a simple point of entry. and the only place to have an entry point would be the centre of a moving bar....Doesnt make sense nor seem possible.

As for the Ad with the lady Jonesy,I think you will find that the straight line you see is actually the top of the axle,as it is sitting further right of Centre.The bar in the image goes right to the front And the flap is of the later style with the hump at the end. Anyways just my opinion. I personally think its just a stabilizer bar or guide. Just my opinion from what can be seen in the Images smile