I would very surprised if the veneeer from a Harbeth came off due to the blue dots. I have used blue tack many, many years ago and no problems whatsoever. I presume blue dots are something similar.
In any event, you can use blue tack if you like...any hardware store. but again, i would be surprised if anything happened. The worst, might be a slight discoloration due to oils in the blue dots...but i am merely speculating here. And that would still take years to occur...and further, its on the bottom of the speaker.
Good luck...you could also email Harbeth...i imagine they would definitely have a good answer for you.
In any event, you can use blue tack if you like...any hardware store. but again, i would be surprised if anything happened. The worst, might be a slight discoloration due to oils in the blue dots...but i am merely speculating here. And that would still take years to occur...and further, its on the bottom of the speaker.
Good luck...you could also email Harbeth...i imagine they would definitely have a good answer for you.