You don't need a damper.
You need experience & to keep communicating.
It's difficult for a non VI stoker as their view is impeded by the pilot, but obviously worse for VI stoker.
You as pilot will need to fill her in on what she can't see. She will need to put her trust in you & 'go with the flow' on the bike. She will need to try to remain neutrally balanced & particularly avoid pulling on the bars or trying to fight the direction of the tandem, or she will produce 'rear steering'.
Both try to relax & most importantly enjoy it! Happy miles....
Hi Jill and Eifion, I used to sell Dawes tandems, it would be helpful to see a close-up photograph of your tandem headset and fork crown. Dawes used a number of different headsets, the original ones were Tange chrome, however, would expect yours to be of a later design which can affect the overall stack height. May still have spares should yours match the ones we sold in the shop.
Let us know.
Pippa and John (Nottingham)