Hi B_S,
Firstly thanks for the kind words and yes the 20 inch Series One machine will be done over the winter when it's not required.
At this stage it's a fully functional survivor and I'm not ashamed to use it like it is as it purrs like a kitten.
As far as the clutch grip is concerned it's from a Model 45, but I can't say which exclusive variant it's from otherwise everyone will want to find that version

and they'd be none left to be had. Ha Ha Ha !............................................Ok the electric version. This was done as a safety precaution so as to avoid an electric shock should something go wrong with the power cable etc and turn the metal of the machine Live.
That's the only real part that's worth salvaging from those mowers that fetched no more than $50 tops for so many years. Now you'll always find a sucker that thinks he's secured a bargain at $200, only to get sick of draggin' a heavy 240 extension cord around behind one's self. Then they oddly get resold soon afterwards again and again.
One thing about Electrics is that many of them have superb handle bars and transmission parts on them as the people that bought those types originally kept them indoors well out of the weather due to them being an electric appliance opposed to a smelly petrol machine relegated to being left outdoors. Many of the electrics also have good catchers without any rust due to this indoors thing happening.
So there you go..........another secret let out of the bag, don't tell anyone please ?
Cheers,
BB.