No, the Microsight comes in a hood, with a relatively large aperture, and I use it as-is. It has a "screwdriver" notch to tighten it into the sight leaf;a dime works for a screwdriver.
I used a 0.042" or 0.036" aperture for max depth of field without the Microsight, and keep the 0.042" hood in the rifle case, "just in case" - but haven't had to switch back to it. Small apertures like that give you "spider weds" - there is a name for the optical effect that escapes me right now.
The threads on the Microsight hood are the same as what White Oak and some others use for their sight leaves and hoods, but I think the Bob Jones threads are different, and Compass Lake different from both.