SW reflector focus screw. Welcome › Forums › Help and Advise › Scopes › SW reflector focus screw. This topic contains 1 reply, has 2 voices, and was last updated by KurtJESUS 5 days ago. This post has been viewed 19 times Viewing 2 posts - 1 through 2 (of 2 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 days, 21 hours ago by Mark. 11th January 2018 at 5:08 pm #2143 KurtJESUSParticipant Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.