Moves the utility wheel to the specified position. The position may be specified by a number in the range 1-16, or by name. The position names are:
Align, Clear, Wollastn, SlowCam, Mask,
J_grism, H_grism, K_grism,
IJ_grism, JH_grism, HK_grism,
Foccal, Focus, Hart2, Hart1, BigClear
These names may be abbreviated.