Freon,
Thanks for your considering.
Could you give me more information about who John Breen, "Anindya", "Superpiper" is.
I think 1 or 2mm is negligible at field if adjustable type is available, isn't it? However 1 or 2mm caused by thermal expansion excepting adjustable support shall not be negligible.
Anybody has an idea, please let me know.
Regards,
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D.H.SEOK