Hi, Here is my fix. String and hot melt glue.
This is very fiddly, however, it will result in perfect functionality and will last for ~57.8 years. This arm is well worth the effort I reckon.
It required 2 mods to the internal mechanism.
1. Break off a little metal tab near the knob. Procede gently with pliers.
2. Drill a small hole into the adjustment knob for the string to be retained. Feed the ends of the string into the hole "Glue and Screw" retention.
I used orange goo remover to loosen the nail varnish or whatever is holding the lower horizontal bearing together.
Get your head around the mechanism and the attachment points will become obvious.
One gotcha is that the edge of the teeth of the large cog sit in a recess so be aware of that when you glue the string to the large cog. Do this before attaching the string to the adjusting knob and check for free movement. Luckily for me hotmelt glue is easily trim-able.