Hitch wrote:
Item 19 looks like the offender....remove the table and the housing over the wheel (14) by the look of it
You're looking at the spare parts list for those numbers, and the exploded diagram, yes?
I think there may be a mismatch

in the diagram, #19 is indeed the screw that needs tightening, but in the list, there are 4 #19's.
Looking at this diagram (don't think it is in the printed manual - have to check again) I think you are right - remove #14 - the guard and I should be able to access it
I will get back to confirm.
Re access without disassembly - the lateral thinking way - I saw two possibilities - one is by removing the sanding disk paper and that exposes a hole and with the right size allan key, you could insert it, but the amount of rotation possible is so little ( and the key supplied too long) so discounted that as "the way".
There is also nearly access at the bottom after removing the dust extractor plastic part, but again the allan key is a touch too long - and as this must be something that probably needs a little tighten now and again, can't be the way.
Thanks for the ideas and suggestions - appreciate it

and if I can#t get to it, I'll have to ask for my money back
Hmm - THAT won't work either

I went to a bookstore and asked the saleswoman, "Where's the self-help section?"
She said if she told me, it would defeat the purpose.