I consider to update my Newtonian telescope by an ASA OK3 or OK3-Z focuser. I am aware that this will require drilling new holes in my OTA. But what I must anyway know in advance is the total height of the focuser. If it is too high, then adapting the telescope would be much more complicated than just drilling a few holes. Unfortunately, I was not able to find the required dimensions on ASAs site or anywhere else in the internet.
So can anybody who has an OK3 or OK3-Z tell me the height from the OTA to the upper edge of the drawtube, without ASA's extension tube? Ideally the values for minimum and maximum focus position?