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I had a nice NG 127mm triplet a while ago and optically it was very good but like you are finding the focuser was rubbish ! , I lashed out $900 on a Feather Touch 3135 and adaptor for it and man !!! that IS !! a focuser , but the price is 1/2 the total scope , see photo .
Fast forward to now and I have an excellent iStar 127mm f8 doublet with a member here's old 120 Esprit focuser ( he upgraded to a ML ) and while not perfect it is similar to the LP focuser you linked and after a bit of fiddling with have found it to be about 80% as good as the FT so you will really like one if you grab one , head and shoulders above the standard 127mm triplet focuser .
Hope this helps .
Brian.
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