I have a Marantz TT440 Linear Tracking turntable which needs a belt replacement. As on many linear tracking turntables the turntable platform is locked onto it's foundation not from the frontside but from behind the platform itself. This means that you must open the complete box to remove the lock ring which holds the turntable in place.

Once one has removed the screws from the back of the case one discovers that Marantz has added 3 more screws (or something!) which must be removed by aligning the platform to expose three resesses under the platform. They are deep resesses, and the type of screw utilized to further secure the cas to itself underneath the platform is impossible to detect. It should come as no surprise that I have found myself stumped in my attempt to try to open the turntable casing up to this point in order to... remove the lock ring, so I can remove the turntable platform, so that I can replace the darn turntable belt. Is it possible that there is something deadly and nuclear that Marantz wanted to protect me from touching here?

Anyway, I'm hoping that some kind soul out there may have more knowledge regarding this than I and can tell me how to get this turntable cas open, so I can replace the turntable belt, once and for all.

Or will plastique be necessary?

Thanks in Advance.