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I sit corrected regarding the "dust cap". Mine was firmly attached to the shaft. It did take some effort to separate the two shafts. Tried with my son, no luck. Few taps with a rubber mallet, then plastic dead-blow. Nothing. Since I was going to replace the u-joints anyway (about $15 each...

Having just replaced mine, I THINK the purpose of the zerk fitting is to allow some grease into the splines so you can eventually separate them for replacement/repair. That end cap piece is integral with the shaft and has a seal on it. Don't recall exactly how much I spent for it, under $100...