GEAR UP LNDG ATTEMPTED. GAR EXECUTED.

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ON A VISUAL APCH TO MILLARD AFTER CANCELING IFR I DSNDED BELOW 4000 FT MSL. ONCE BELOW 4000 FT THE TURB INCREASED TO MODERATE OCCASIONALLY SEVERE; I EVEN HIT MY HEAD ON THE ROOF A COUPLE TIMES. ONCE ON DOWNWIND I REACHED FOR THE GEAR SELECTOR AND SELECTED GEAR DOWN. I REMEMBER MY HAND BEING JERKED OFF OF THE SELECTOR DUE TO THE TURB. I WAS ON DOWNWIND FOR RWY 12 AND THE AWOS RPT WAS XA13Z 5000 BROKEN; 10 MI VISIBILITY; TEMP 77 DEGS F DEWPOINT 54 DEGS F; WIND 190 DEGS 13 KTS GUSTS TO 26 KTS; ALTIMETER 29.76.' DENSITY ALT PLUS 2700. I WAS CONSTANTLY JERKED; BOUNCED AROUND. I QUESTIONED SEVERAL TIMES WHETHER OR NOT I WOULD BE ABLE TO LAND. ONCE I TURNED ON FINAL THE TURB INCREASED AND I ADDED PWR BECAUSE I LOST AROUND 20 KTS OF AIRSPD. ON SHORT FINAL I GLANCED AT THE GEAR LIGHTS AND IT LOOKED LIKE THEY WERE ON BUT THE SUN WAS HITTING THEM DIRECTLY. I CONTINUED THE APCH. ONCE OVER THE RWY THE WINDS SEEMED TO DIMINISH A LITTLE. IN THE FLARE I HEARD A SCRAPPING NOISE; I ADDED PWR AND WENT AROUND. WHEN I REACHED FOR THE GEAR SELECTOR I REALIZED THAT IT WAS ONLY DOWN TO THE NEUTRAL POS. THE NEXT APCH AND LNDG WAS FINE AND UPON SHUTDOWN I SAW THAT I HAD HIT THE PROPS AND BENT THE TIPS OF BOTH ENG'S PROP BLADES. AFTERWARD I REALIZED THAT NO MATTER HOW MUCH OF A HABIT; A PERSON CAN MAKE A MISTAKE. I USUALLY CHK GEAR DOWN AT LEAST 3 TIMES. UNDER CERTAIN CIRCUMSTANCES HABITS AREN'T ENOUGH.