Old Britts Headsteady

Just got another MK3 it has an Old Britts Headsteady fitted to it ...anyone else have one of these on their bike?...Would like to hear feedback if possible.....Thanks.

It is a good head steady. Much like the Norvil PR unit, but of course vernier adjustable.
I have the Norvil unit and once set. it seem to stay that way. The vernier adjustability would be nice but really not totally needed. I think you are lucky to have it.