FEELING PRESSURED TO GET ALL THE ASSIGNED MAINT WORK ACCOMPLISHED ON A CRJ-700 PRIOR TO DEPARTURE; MECHANIC REPORTS HE FAILED TO NOTICED THE R NOSE TIRE WHEEL SPACER REMAINED STUCK TO THE REMOVED TIRE.

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I WAS CALLED TO ACFT X FOR NOSEWHEEL SHIMMY; OIL SVC; AND CABIN LIGHTS INOP. I WENT TO PARTS TO GET ACFT JACK; JACK KIT; TORQUE WRENCH AND NOSE TIRES. I PRINTED THE NOSE TIRE CHANGE WORK CARD AND PROCEEDED TO THE ACFT. AFTER JACKING THE ACFT; I COULD SEE THE NOSE TIRES WERE OUT OF ROUND; AND PROCEEDED TO CHANGE THEM. I WAS FEELING PRESSURED TO COMPLETE THE JOB TO GET THE ACFT FLT READY AND WHEN I TOOK OFF THE R NOSE TIRE; THE SPACER STUCK TO THE OLD NOSE TIRE ASSEMBLY. WHEN INSTALLING THE NEW NOSEWHEEL; I FAILED TO CHK TO SEE IF THE SPACER WAS IN PLACE AND INSTALLED THE NOSEWHEEL ASSEMBLY WITHOUT IT BEING IN PLACE. ON PUSHBACK; THERE WAS A LOUD NOISE IN THE NOSE; AND THE PLANE STOPPED AS SOON AS THE CREW HEARD THE NOISE PREVENTING ANY ADDITIONAL DAMAGE. THE PLANE WAS TOWED BACK TO THE GATE; NEW NOSE TIRES WERE PUT ON THE ACFT; AND THE FLT DEPARTED WITHOUT FURTHER INCIDENT. I WAS FEELING PRESSURED TO COMPLETE THE JOB BY THE 'HARD TIME' AND ALTHOUGH I HAD A WORK CARD; IT IS 8 PAGES LONG; AND MORE USEFUL IF A PERSON HAS LOTS OF TIME TO READ IT. THERE IS MORE INFO ON THE WORK CARD THAN IS ABSOLUTELY NECESSARY TO DO THE JOB; AND IT'S EASY TO GLOSS OVER THE INFO THAT IS CRITICAL TO DOING THE JOB. I THINK THE WORK CARD SHOULD BE SIMPLIFIED TO THE STEPS ABSOLUTELY NECESSARY TO COMPLETE THE JOB. BEING LINE MAINT; TIME IS ALWAYS A FACTOR; BUT SOMETIMES IT CAN CAUSE ADDITIONAL PRESSURE WHICH IN TURN CAN CAUSE MISTAKES. MECHS COULD BE GIVEN MORE TIME TO ADEQUATELY PERFORM THEIR JOBS.