••• 
In answer to the many mails received almost daily regarding the double base plate for the EQ6 supporting 2 telescopes, go to telekop service 
Acknowledgements: I want to thank Chistophe Demeautis for his remarkable work on the analysis of telescope mounts
I also wish to thank Sp@ceCowboy for his additional analyses,
and for his help on assisting with the interventions on the telescope mount.Note : the entirety of these operations are applicable by extrapolation to the HEQ5 mounts.
We however did not verify this possibility ourselves.
It's up to the reader to verify the pertinence of these operations on a HEQ5.I• modification costing 20 euros
Here you can see an ordinary curve of a standard EQ6 mount: it is extremely difficult to extract any periodicity. However this operation is required if you want to analyse the behavior of the mount and when you want to execute the required changes. We hence need a mathematical method called the (fast) Fourier transform (FFT). See the different FFT curves at the bottom of this page. 



Click to enlarge the exploded view with the technical details 




II• Modification costing 220 euros • Changing the gearboxes of the EQ6 + Update of the EQ6 electronics circuitry 

• What is the impact of changing the gearboxes? Click to see the analysis


analyse FFT 
Also available: Czech translation on the site http://web.telecom.cz/elektrometal/III • modification costing 70 euros
• The bearings to change on the EQ6
This operation is still pending
Here's the list of the bearings to be changed, knowing that the first 4 are essential as they are directly encountered in the kinetic chain of the drive
SKF6008 2RS : 19.73 euros (+ tax) x1
32208 conical (TINKEN) 40x80x23 : 35.81 euros (+ tax) x1
SKF608 2RS : 6.01 euros (+ tax) x2 (hour tracking screw)
The bearings on the toothed crown only serve in manual operation; when the axis is locked and the tracking is engaged, then those bearings don't rotate, so there's no need for replacing those.Thanks to Alexendre (alexandre.lambolezatwanadoo.fr (spam countermeasure: replace at with @) for this list of bearings :)
IV• modification costing 0 euros
• the PEC on the EQ6
being written right now