The Albatrose adjusters seem the best way to go about it. I've heard of another make shearing while driving 
Mine has a Foksy adjuster from www.bluebird-type2.co.uk on the top beam but does make the ride quite harse as the bottom bean is quite loaded.
OP
Mine has a Foksy adjuster from www.bluebird-type2.co.uk on the top beam but does make the ride quite harse as the bottom bean is quite loaded.
OP