sure u can do anything to your table, the thing with drink holders if its glass, from time to time a shot hit to hard might accidently break the glass or beer, or what ever it is, it has happen, so just be weary if it u put drinks on it, next to know is, u can change the handles to the plastic ones if u choose too, just like the players the handles have pins tooo,
when u do play, if u dont like the feel of the handles, u can buy foosball grips, u can buy these online, or just buy tennis grip, its about the same thing , just dependin on the grip some last longer than others depending on play time, u could clean all the bars, just dont use double D 40, that was never meant to be a lubricant on the bars, get some liquid silicone from, ur nearest supplyer or, goto foosball.com and purchase some.
dont clean your bars untill u get some liquid silicone, that lube is the best for the bars, and only just alittle needs to go into ur dual bearings to lube the whole bar,
u should check all the pins to see if anything is cracked or not, instead of just knocking them out i was just practice controll with the ball, and also check the level of the table,...
what u would do is spin all the feet wheel counter clock wise so the feet are as close to the top, and use a level,, or adjust so there is no slant or anything u can do this your self but it can be alot of work, but once u learn how to u, u can adjust anytable by urself, becareful it is a realy heavy table use 1 knee to lift and adjust dont just lift with your back and adjust u could get a hernia LOL trust me it has happened
after u checked all the pins are good HAVE fun practicing, and if u have any more questions feel free to ask away,