Yes, the seat is already positioned correctly. (It's somewhat different from the way it's photographed above) Having ridden the bike 157km on Thursday and about the same distance back home the day before yesterday, today I stripped the excrescences from the handlebar and delivered the bike to the shop. It's going to get a new quill stem. Choosing the most appropriate one, ordering it and putting everything together is all taking rather longer than people might expect if they didn't realize that this is a sleepy time of the year in Japan. For the next couple of weeks I'm down to one bike; it's a coeval of the one above and fun in its way but it's not for long distances.

The bike already has a new and longer (and thus probably safer) seatpost. The combination of slightly adjusted saddle and new seatpost is an obvious mismatch for the under-the-saddle bag. When I look at the photo above I'm surprised to see that the previous arrangement was just as bad: the plastic clip attaching the bag to the under-saddle mount was permanently bent 20 degrees or so. Amazing (and a credit to Deuter's idiotproof design) that it never broke, and amazing that I never noticed anything wrong.