Yes that piston is supposed to be loose like that, it is the oil piston. By that piston being loose is how it varies the oiling from idle to top end. As for the O-ring I can't help yeah there. I just tore a late model VRO pump apart and it has a plastic piston in it without an O-ring, but it is a VRO2 pump. Any obrstruction to that piston movement can cause issues with the pump though.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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