Welcome. I've heard of these needles recommended as a 20x1 sub before but I haven't tried it. The needles are very similar in dimensions but the DPx35 is a round shank needle while the Eldredge Rotary needle is flat. A lowered 15x1 is another option. 15x1 is closer to the original needle with it's flat shank. The Dpx35 has the advantage of not having to fool with the needle height. DPx35 also goes by 134-35.
Jon