P.S.
Talked with Al. It seems his old barrel connector is not the same as mine, so check your own to see if they are reusable this year.
Not all old Linksys connectors are the same as the D-Link.
The outside barrel must be the correct fit, but also the inside center must not be loose (Al's issue) on the D-Link pin. Some barrel connectors have a larger center hole than others. The ones we got with our Linksys in 2009/2010 have, in addition to the center hole, a pair of spring contacts.
Here's a
comparison shot of one of the Linksys wall-warts that matches the D-Link.