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Arief,
The biggest issue will be the difference in ballast between the two mirrors meaning the centre of gravity of the 10" OTA will be much higher than what the 12" structure is designed for. The dob will be significantly top heavy.
You will need to add weight to the mirror box in order to re-establish the COG and correct balance geometry.
Trying to get around this with friction mechanisms for a quasi balance will create a dog of a dob as the action will be so tight so to make it impossible to attain quality of action necessary for a scope, along with a horrendous amount of backlash.
Alex.
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