Sorry – I’ve been away too long and tiny things have changed – there’s links in my previous post and I can’t figure out how to highlight them as links :/ Probably just as well since some of them are wrong…

So – to answer your question – The “fix” was proposed by AX84 forum member Iain who designed the circuit LINK
The revised schematic is courtesy of AX84 forum member Stephen Keller: LINK

Page 2 shows the original schematic, Page 3 shows the revised schematic with the changes made.