here is Betsons link THE place for most anything pinball related. We used to buy from them exclusively way back in the 80's (back then they carried EVERYTHING from the sit-down cabinets to Gottleib, Williams, Bally, Data East, and others) but they are still in business
http://www.betson.com/about/offices.html
you can buy a level most anywhere, HomeDepot sells little levels also for about 5$ US
oh and if the flipper sticks flip the table up and look at the rod that passes thru the solenoid sometimes thru extensive use the end of it becomes mushroomed causing it to stick and burn the solenoid up! just take it out and file down around the outer edge of it to make it beveled, that should solve the stickling problem. While you are in there check the sleeve it travels thru. it may have cracks in it also, causing the flipper to stick and clean it with a good plastic cleaner or just a clean cloth inside that sleeve.