Help with a new 3s and a (old) new rc enthusiast

[jbart72]

Need help with a 3s I broke the left front suspension arm and apparently the left drive shaft needs to be replaced but the screw that goes into the differential gear box seems to just spin the gears any suggestions????

 

[biggman100]

Need help with a 3s I broke the left front suspension arm and apparently the left drive shaft needs to be replaced but the screw that goes into the differential gear box seems to just spin the gears any suggestions????

You have to hold the other side to keep the diff from turning. Just put your finger on the other driveshaft to keep it from spinning.