Do you have access to a lathe? On Lexels I often use an alignment aid consisting of a 15 mm brass "pig" that goes in the optics holder and has a 0.65 mm hole centered in it for the HENE beam. This forces the alignment to the high gain, central region of the bore and greatly aids in lasing.
How many amps do you have in the plasma?
Was the Buna-N O-ring in the back of the threaded optics mount against the mirror?
Steve
Qui habet Christos, habet Vitam!
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When I still could have...