I saw a thread a while back about doing this. Has anyone tried it? The springs on the new b66/b67 line seem to be a bit heavier gauge than the older ones, perhaps heavier than the b73. I once owned a B66 and it didn't seem to do much for me. I only weigh 140 lbs. Could I switch out the springs on a newish B67 for the springs on a cheapo saddle...or some old springs off a vintage Brooks saddle?