Originally Posted by
Sixty Fiver
Prestige derailleurs shift beautifully and in many cases the jockey wheels are the weak point... these can be replaced with Suntour jockey wheels.
That's correct.
Here the ball-bearing equipped Simplex jockey wheels are much better than the standard ones (it seems the early 60s Simplex RD came in 2 versions: ball-bearings vs. bushings
see:
http://members.jcom.home.ne.jp/r.amaki/prestige.htm
1962: first -> jockey wheels with bushings, second -> ball-bearings / 1963/64: ball-bearings etc.)
I use some of the latter on my bikes which I received in (partly very) neglected state. After cleaning, greasing and adjusting play these work impeccable as new.