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Use 2 mm drill to clear screw bore of optical interruptor bar. M2 Screw must readily slip through the bore.

Just as with armature, do not use hot air for post print processing of this piece. The thin optical fin may get damaged.

A real hex driver is essential. Attempting insertion of the M2 hex cap screw with an Allen key is guaranteed failure. Depending on your screw head, use a H1.3 or H1.5 from a micro-screwdriver kit..

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