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Entropy,
You have one problem you have identified and I suspect you may also have a second problem you have not yet identified depending on the camera/filterwheel system you end up with and your mount or the new mount you are getting.
The FSQ106 is a very back heavy scope owing to the 4 element Petzval design.
As such, once you add a camera, rotator, possible OAG etc etc you will find this to be an extremely backheavy system - so you have to move the whole OTA very far forward on the saddle plate.
Adding a big camera and filter wheel results in large diameter mass on the back of the OTA and this will need some clearance between the OTA and the mount or saddle plate.
Most OTA rings off the shelf do not facilitate this level of clearance, so you need to make up your own OTA Ring spacer block
This fits between the OTA rings and the Dovetail
Typically about 25-30mm is required.
More often than not a front OTA counterweight is also required - this is not a small mass either !
This can be achieved by using a second dovetail plate in the same dovetail which has the weight attached to its underside.
But a lot depends on your configuration.
So to solve the first and the second problem, in one go, I suggest you make up your own spacer block and that will allow you to have two sets of holes - one that matches the ADM/Losmandy bolt hole spacing and the other set of holes to match the FSQ OTA rings.
If this isn't a problem with the EQ6 - it will be a problem with many other mounts (with larger camera/CFWs).
Otherwise you will need to countersink the bolt holes and use countersunk socketheads to get them out of the way.
But bear in mind just how far forward they will need to be when fully loaded first before you start drilling !
Rally
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