Hi Andrew,
Wouldn't consider building yourself a new base? I made one with a mate for an 8" f/4 scope. One good thing about this base is that the OTA can be removed from its dob cradle and mounted back onto its eq. mount. Best of both worlds this way. Cheap to build out of exterior grade ply (we just used C-D grade pine ply), a few bits and pieces and a couple of licks of paint, less than $60 for the mount. The excess ply (we bought a whole sheet) was then used to make ANOTHER dob mount for the kids 3" reflector!!!
I've included a pic of the 8".
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