Constnatly turning the reel causes developer to flow through the sprocket holes causing more development around them. Donate your tank to a museum and get a SS Nikor or similar tank and reel. Agitation is by inverting the tank with a swirling motion. Agitate continuously for the first minute. Wait 60 seconds and then agitate 4-5 times at the beginning of each minute thereafter. Each inversion should take about 2 seconds.