Hi, I’m responding to Ken’s private tip of this interesting topic. Unfortunately, I don’t have a final solution, yet… I have planned to replace the poor Lunt focuser from the beginning and probably will do it if my Lunt 60 telescope mod using the SW150/1200 mm turns out to be successful. Unfortunately no sunshine here since the first short test 3 weeks ago and not much hope next week either. I have skipped the FeatherTouch model as too expensive compared to the Lunt 60 telescope price. So far I have not searched seriously for other options. As a first aid I installed a cheap Sky Watcher Motofocus which made the focuser more usable but bulky. The Lunt focuser is attached to the telescope body with a dovetail and 3 recessed hex screws (4 mm diameter) very near the edge. The dovetail front diameter is 78mm and its length 6 mm The Lunt body takes a 78 mm diameter focuser so it is perhaps not a common standard. The Lunt focuser body length without the dovetail is 52.3 mm plus the 2” adapter 14 mm and has a 34 mm travel. Many refractor focusers have a long focusing tube protruding far inside the telescope body. The Lunt body can take only 33 mm because of the etalon module. The Steeltrack refractor model may have a too long focusing tube (looking only on the image). The Steeltrack Newtonian version is very nice and short and even has a dovetail, if only the dovetail diameter would match, but I haven’t found any measurements for it. First I would research the Steeltrack Newtonian dimensions and then consider the much cheaper TS TSFOCR2M for 148 EUR. However, the TS diameter is only 72 mm, so a simple 3 mm spacer ring would be needed. I use the TS SCT version (158 EUR) in my PST mod and it works great. Best wishes, Viljo