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The original focuser on my C9.25 had woeful slop and play - stars would jump wildly when I changed focus directions. The backplate the focus knob was mounted on was too thing and would flex easily too.
In the end I added:
1. Feathertouch microfocuser - like the one before - it is great and has a really solid - flex freee mounting plate
2. Meade Motor focuser
3. JMI USB controller for the Meade motor focuser
Add your Bhatinov mask and all is well. In fact with a Carbon fibre tube I only have to tweak focus one every few weeks if the temperature is pretty constant.
Since adding the above mentioned gear stars don't jump at all when I adjust focus - and that's great!
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