Neil Smith wrote:Re magnetic corner clamps:
There are those from York modelmaking but I have been pleased with a pair I bought here about a year ago:
http://www.smartmodels.co.uk/magnetic-clamps.html
I have not tried them out on brass soldering - I would be fearful of the heat damaging the strength of the magnets - but whitemetal probably would be fine.
All the best
Neil
I don't remember a problem with brass personally.