The attached figure shows a summary of the current situation IMMT2-PRM-PR2. How do you think about the next step??

• IMMT2's centering is hard to be checked, though.
• Need to also check input GRX spot on the back of PR2 HR target; this spot should overlap on an IR beam reflected at PR2 toward PR3 (not input from IMMT2 to PR2). According to Fig. 3 of 29261, this spot seems also illuminate +Y side of the center line on PR2 HR target, but this should come rather miuns Y side. The target moves together with PR2 traverser, while GRX beam path won't move together with the traverser, as the steering mirror POP-POM is on the suspended table. So this might indicate that PR2 would be dislocated in the minus Y direction now. If we can somehow move PR2 with the traverser in +Y side to some extent (5 mm would be too much? then a few mm...), these mis-centering might be resolved to some extent.

A modified drawing of 29285. We mis-understood that the nominal distance from the center of "the optical beam from PRM to PR2" and the center of the "PR2 HR mid baffle aperture" is about 6 mm according to JGW-T1910200-v4, while the correct nominal number of this center-to-center is 4.8 mm according to JGW-T2113078-v2. Hirata-san has confirmed 4.8 mm is correct center-to-center with CAD.