SW reflector focus screw. Welcome › Forums › Help and Advise › Scopes › SW reflector focus screw. This topic contains 2 replies, has 3 voices, and was last updated by Mark 3 months ago. This post has been viewed 104 times Viewing 3 posts - 1 through 3 (of 3 total) Author Posts 10th January 2018 at 11:37 pm #2122 markhParticipant Hi Does any know the size of the screws that hold the plate (that holds the focus knobs). I think they are m3 or m4. cheers Mark. (the black bit as below) This topic was modified 4 months, 1 week ago by Mark. 11th January 2018 at 5:08 pm #2143 KurtJESUSParticipant 21st February 2018 at 6:07 pm #2239 MarkKeymaster Just an update. These are M3 machine bolts. Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic.