Same thing happened to me.. Make sure your weapons are unlocked.
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Never mind got it
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K good. :)
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Just did and still nothing. Hmmmm
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Ok dumb question but my friend did this. Are you trying to infuse by clicking the spindle and going to the yellow infuse icon? You should choose the gun you are upgrading and then go to infuse icon and select the spindle. Hope you figure it out.