Gday Kon - lol - this is one of the configurations (with cameras - guiding and imaging) that prompted me to go to the EQ6. With this load I found the HEQ5 always struggled and guiding was rubbish. However I wish you well - you might be luckier (especially with an extension).
If you are going to put this on the mount - I dont think it matters where you put the scopes on the twin dovetail saddle bar as long as it is balanced in 3 axis' counterweights, scope horizontal and scope vertical and all points in between (usually an iterative procedure is required) on both sides of the mount as a check.
Bolts
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