Well, since you have
Dynasty, you'll have to buy an 8 inch drum and a new rail assembly. Then you're going to have to take each drum off of the old rail, and put them on the new one.
I'm in the same situation, except I have the 8 inch and need the 6.
There is no way to create more space on
Dynasty tenors because of the way the rail is set up. Each drum has a specific part of the rail drilled out where it is screwed onto, so therefore a whole new rail is necessary.
Get in touch with the guys at Columbus Percussion (when I e-mailed
Dynasty, that's who they said I shou;d contact) and they shold be able to help you out.
If you need any help with taking the drums off of the rail, just PM me, and I'll talk you through it.