Hello guys!

Ihave got a 2003 audi a4 b6 1.9tdi quattro 6 speed manual transmission car.
My question is about the gear lever or gear shifter arm,my problem is that i can put reverse whitouth pushing down the gear knob sometimes i put reverse instead 1st
And i cant shift in 2nd gear. I noticed that if i pull up the gear lever or knob like 1 or 2 centimeters everything works fine reverse ant 1st 2nd gear too. Then i took off the plastic thing around the gear knob and i can see a big ball whitin a plastic house this ball is moving up and down like 1 cm if i pull the whole thing up everything is work like it supposted to but if i just shift if you dont concentrate you can shift reverse or first gear by accident.so my question is about this whole assembly i mean this plastic ball and some washers need to be replaced and or rebuilded any got any information about this problem?
I hope everyone can understand this long story ;D