Used, good condition.

Mount a 2D Galvo System to a Post, 30 mm Cage System, or 66 mm Rail Carriage
Three Bottom-Located 8-32 (M4) Tapped Holes for Post Mounting
Four 4-40 Tapped Holes Centered Around Input Port for 30 mm Cage Compatibility
Two Bottom-Located 4-40 (M3) and 1/4"-20 (M6) Tapped Holes to Attach to XT66P2 (XT66P2/M)
  or XT66RC
Internal SM05 (0.535"-40) and SM1 (1.035"-40) Threads on Input Port
Internal SM2 (2.035"-40) Threads on Output Port
Compatible with Thorlabs' Selection of Scan Lenses (See Table 601C)
Thorlabs' GCM102(/M) is designed to securely mount any dual-axis, small beam diameter galvo mirror system. Once installed in the mount, the galvo system can be attached to a post, 30 mm cage system, or 66 mm optical rail carriage, as shown in Figures 601D, 601E, and 601F.

The mount features an internally SM2-threaded (2.035"-40) output port that, when used with the proper adapter, allows any of our scan lenses to be attached at the proper scan distance from the galvo mirrors; see Table 601C for more details. The input port is both internally SM05- (0.535"-40) and SM1-threaded (1.035"-40) for direct compatibility with Ø1/2" and Ø1" lens tubes. Additionally, four 4-40 tapped holes centered around the input port provide compatibility with 30 mm cage systems. When each port is used in combination with our lens tubes, port plugs, and/or scan lenses, the system will be light tight. The input and output ports are centered around the X- and Y-axis galvo mirrors, respectively; please note that they are in different planes.

The bottom of the mount includes two 1/4"-20 (M6), three 8-32 (M4), and two 4-40 (M3) tapped mounting holes. Each mounting hole is aligned for compatibility with our C1511 (C1511/M) and C1545 (C1545/M) post clamp adapters; Ø1/2", Ø1", and Ø1.5" mounting posts; and XT66P2 (XT66P2/M) and XT66RC rail carriages, as shown in Figures 601D, 601E, and 601F. Please see section 3.3 of the manual for more details about the various mounting options available.

The X- and Y-axis galvo mirrors are mounted using the two through holes in the side and rear of the unit. A flexure clamp that is actuated using the included 5/64" (3 mm) hex key secures each galvo mirror in place. An SM05-threaded viewing port is provided above the mirrors to assist in installation, while two 1/4"-20 (M6) through tapped holes provide access to each flexure clamp. The SM05 port and 1/4"-20 (M6) through tapped holes, which are located on the top of the GCM102, are blocked using an SM05PL plug or a 1/4"-20 (M6) setscrew, respectively, so that the system can remain light tight. For step-by-step instructions on how to install the galvo mirror, please see section 3.1 of the manual. 


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Photos:
All photos were taken with a mirrorless camera and adjusted white balance using a grey card.  Minimal processing.