I need to replace the spring of a late 19th-century Paillard 50-note 
musical box movement.  Having measured the spring drum and arbor 
diameters (19.3 mm and 6.4 mm), thickness 0.28 mm and width 9 mm, 
I ordered a new spring from Meadows and Passmore, reduced it to 
465 mm length and fitted it.  The result is the whole winding system 
is far too stiff.  Advice most welcome.

Adrian Gobat, UK