I have the same double fork. Still flying with Van's Tailwheel, but it has different axle requirements, much like your DJM Tailwheel bolt, from the sounds of it. If the bearings are pressed in, like those on the Van's tailwheel, you can probably push them out. I found the bearing was made by freeway corporation and the specs for the bearing are here:
http://www.freewaycorp.com/bearings_...ies1_print.pdf
Anyway, take a look at it. Perhaps that could help. The company that sells the bearings is Cassidy Sales at (952)882-6338. There's a minimum order of 20 bucks or so, so order enough bearings to make it worth it.
Not sure if it will work for DJM, but who knows...