On the clutch fork, the opposing side to the slave cylinder...
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another tip: file any burrs off of the clutch hub splines and the input shaft splines, then lubricate the input shaft with graphite. (no not use any kind of grease or wet lubricant, graphite is a dry lubricant that will not sling off or attract dirt/dust)
the graphite will help make it go into gear easier and shift quicker.