i wonder if it was updated. b/c info says m1.7, a M2 screw and tap both thread in loosely. i finally had to tap it to M2.5 to get a screw that worked w/a servo saver. works great, but boy a lotta work. perhaps there is an update and the screw is now a M2.3 (that size is annoyin too) like the larger servos despite its smaller overall gear size. that inturn maybe behind your case issue

R