Honda-SOHC

Not sure if it will work long term but used some Epoxy Resin repair solution to fix a broken section.  I added some micronised graphite to make it black.
I have some proper paint for flexible plastics that I will paint it with eventually.
Cleaned/roughed up the broken area & drilled it for a couple of strengthening pegs plus some saw cuts to help the bonding.

.chainguard 1 by Macabe Thiele, on Flickr

.chainguard 2 by Macabe Thiele, on Flickr

.chainguard 3 by Macabe Thiele, on Flickr

I have found the longer the extension bar the better my cordless impact driver seems to work - I call it the torque stick effect!

This might be irrelevant but.....

At the start of your thread you mention a blue light for left & green light for right in your photo it looks like a green wire going to the left side sensor or am I colour blind?

Yes I noticed that. I think it's just a different decision on how to best fit everything. Sensor position doesn't matter as long as the rotor is keyed correctly to accommodate that position. My biggest problem was getting both cylinders timed, as you can see the sensors at actually touching and there was no movement left. I had to half the difference and his left it very slightly out but it still runs well.

Oddly enough it took me ages to get the timing marks correctly aligned for 1/4 and 2/3 on my 400 - it was fitted with the Dyna system.
Even though the individual sensors are slotted for adjustment getting it right between the baseplate & the individual sensors took me ages.
It was easy to get 1/4 right but 3/4 would run out of adjustment so then had to move the baseplate a bit, re adjust 1/4 then check 2/3 and repeat as nipping down the baseplate would change the settings slightly.
Definitely worth my effort as the engine sounded quiter & smoother when I finally got it right.
It actually took me attempts spanning several days as I would leave it saying thats close enough only to go back to make minor changes.

Not my place to approve or anything Ted, just wasn't needed though IMO.

OTT v OCD. 😁😁😁

Yes one of my bearings was similarly damaged, when I drilled out the small pin I found the inner right half of the bearing was missing. I suspect it had been broken for some time looking at the crud that was there.
Surprisingly the shaft seemed pretty well supported with one and a half bearings. Sourced a good one from Ken, as a one off repair it would have been too expensive to have a new part specially made.

I think Florence might still have a spare worth a PM.

I'll stick with my fully LED unit for now - truth  is like riding in the rain that is mostly avoidable , riding in the dark is no fun as I get older.