I have just purchased a near-new Mirka Ceros and am interested how you connected it to your Festool vac. I have the CT26E.
The Festool 27mm bayonet does not fit the Ceros screw-in fitting. I tried a rubber coupling, which does work, but its length unbalances the sander ... compared with removing the Festool end on the Festool hose, and then screwing in this hose. The Festool hose feels so better balanced this way. However it would be a pain to remove and replace the fitting each time I want to use the Ceros. I am planning to purchase the 27mm Mirka hose for the Ceros.
The best plan is to purchase and dedicate the 27mm Mirka hose for the Ceros. Do you have a (cheaper) alternative?
Regards from Perth
Derek