AN FA50 CREW; DURING TKOF ROLL AT PHX; EXPERIENCED A BAD SHIMMY AND REJECTED THE TKOF.

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ACFT WAS PARKED ON RAMP AT PHX. CREW LEFT ARPT FOR DINNER. ON RETURN; CAPT PAID FOR FUEL AND WENT TO ACFT TO RETURN CREDIT CARDS. CAPT ASSURED THAT NOSE STEERING LINK WAS CONNECTING AT THAT TIME. CAPT WENT BACK INTO FBO TO WAIT FOR PAX. CAPT RETURNED TO ACFT APPROX 1 HR LATER TO PREPARE FOR DEP. (ACFT HAD NOT BEEN MOVED FROM ORIGINAL LOCATION.) PAX ARRIVED AND COPLT GOT TAXI CLRNC. UPON MOVING FORWARD; CAPT FELT THAT NOSE STEERING WASN'T WORKING. HAD COPLT CALL GND CTL TO REQUEST TAXI DELAY. CAPT ASKED COPLT TO GET OUT OF ACFT AND DOUBLECHK THAT NOSE GEAR WAS PROPERLY CONNECTED. COPLT RETURNED TO ACFT AND SAID GEAR LOOKED NORMAL. WE CHKED THE ABNORMAL CHKLIST AND THE MEL WHICH SAID DIFFERENTIAL BRAKING TO STEER WAS PROPER. TAXIED TO RWY 25L AND WAS CLRED FOR TKOF. AT SOME POINT BEFORE 60 KTS (AIRSPD WAS NOT ALIVE) NOTICED A BAD SHIMMY AND ABORTED TKOF. CAPT TAXIED OFF OF RWY AND HAD COPLT CHK ALL LNDG GEAR AGAIN (FEARING BLOWN TIRE). COPLT AGAIN SAID GEAR LOOKED GOOD BUT THAT NOSE STRUT WAS POSSIBLY FLAT. CAPT THEN GOT OUT TO CHK GEAR AND FOUND NOSE GEAR STEERING LINK PINNED IN 'TOW' POS (NOT CONNECTED TO BOTTOM STEERING LINK). CAPT NOTICED SOME SCRATCHING OF NOSE WHEELS FROM LOWER GEAR LINK; AND UPON ASSESSING CONDITION OF NOSE GEAR; DECIDED IT WOULD BE OK TO CONNECT LINKS AND CONTINUE FLT. REST OF FLT (TKOF AND LNDG) WAS NORMAL. MAINT AT HOME BASE FOUND DAMAGE TO NOSE WHEELS; NOSE LINKS AND NOSE GEAR DOOR CRACKS. ACFT REPAIRED AND RETURNED TO SVC. IN RETROSPECT; I (AS CAPT) SHOULD HAVE CONDUCTED THE LNDG GEAR INSPECTIONS BECAUSE OF THE COPLT'S RELATIVE INEXPERIENCE IN TYPE OF ACFT. EVEN THOUGH I SUSPECTED THE LINKS WEREN'T CONNECTED; I ACCEPTED AN INEXPERIENCED COPLT'S ASSESSMENT AND FIGURED WE HAD A BAD PROX SWITCH AS OUR PROB. I WILL IN THE FUTURE ENSURE CLRER COM AS TO WHAT I WANT OUT OF EACH CREW MEMBER AND; IF IN DOUBT; WILL DOUBLECHK ALL SYS MYSELF BEFORE MOVING THE ACFT.