That is exactly how I removed the focuser assembly when I flocked the OTA on my AR6. I used a 1 foot long 2"x2" with a hammer. After removing the screws, I placed the wood firmly against the focuser assembly - gentle tapping on the wood loosened the assembly and off it came. I would strongly suggest taking the opportunity to flock the OTA at the same time. I used self adhesive black felt from Walmart. It made a very significant difference in contrast. Are you looking into perfect alignment for a chromacor?
Gregg
Gregg