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To overcome the stickiness in the grating tilt bearing that was the
source of the random jumps in our spectra when they should have been
motionless (§6.1.4), we plan to replace the Vespel journal
bearings with flex pivots. Installing a suspension that relies on
torsion instead of slippage should bring about a considerable
improvement in mechanical smoothness and stability.
12/15/1998