I got the email reply from Dremel. Looks like I'll be getting the special 4000 adapter for my 212 drill press. Thanks a lot.
I'm posting the reply here for others that might be in the same position as I had.
Thank you for emailing Dremel. I can definitely send you the adaptor that you are needing to fit your 4000 tool into you 212 drill press. The adaptor part number is 2610923688 and I will send this out free of charge.
I will mail the adaptor to the address listed below. I will mail from Racine, WI. Please allow 5-7 business days for delivery, if you have any questions please feel free to email or call customer service.
Best Regards / Mit freundlichen Grüßen / 以此致敬意
Robert Bosch Tool Corporation
Dremel/Rotozip Consumer Services
Customer Service Rep. (PT-RT/ASA-NA)
4915 21st Street
Racine, WI 53406 USA
Tel: +1-800-437-3635 x 6992 Monday-Friday 7 am to 6 pm Central Time