On April 21, 2012 the pre-collimator for the SXT-S telescope on board the satellite was completed. The picture on the left shows how things looked as the collimator was being constructed in the clean room on the fourth floor of building D at ISAS. The pre-collimator is a device attached to the opening of the telescope. It is designed to limit the incidence of X-rays onto the telescope from only the direction of the target being observed, blocking X-rays from all other directions. In order to be attached to the circularly-shaped telescope, a one-quarter segment mold was manufactured by sliding in 203 thin sheets of aluminum. This can be seen in the picture on the right. Four of these are constructed and attached to a single telescope. When completed, a single piece will have the appearance of a “baum kuhen” cake. The picture on the right is a completely finished collimator.