Join Date: Dec 2004
Location: Fife Scotland
Bikes: Airnimal Chameleon; Ellis Briggs; Moulton TSR27 Moulton Esprit
Mentioned: 2 Post(s)
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You may find that the "H" screw needs backing off a bit. It may change to the large chain-ring but because this requires too much tension on the cable, when moved to the middle it will spring back further than the middle and go to the small chain-ring.
If this doesn't work then clean and lube the FD, making sure it moves smoothly over its whole range of travel.