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The 5201 T-slotted base plate provides the basic building block for an alignment telescope base.  This base plate has two parallel T-slots which provide mounting channels for our 5192 adjustable cone assembly.  The cone assemblies permit the optical axis of any alignment telescope to be precisely adjusted in a variety of ways (shift left-right or up-down, as well as pitch and yaw). The 5201 has three counterbored holes which may be used for customer-supplied mounting.  The counterbored bolt hole pattern also fits the discontinued K+E style collimator test stand, model 7010. It also has a 3½"-8 threaded hole in the center for mounting directly to a stand or any accessory having a matching external thread.