Ok back and forwards is fine as long as you cannot move it up and down then the drum is fine which is good news.
If you are getting a clicking noise then its either the motor itself or possibley something stuck in between the drums like a bra wire.
For this you need to pull the washer out and remove the back panel.
From there just take the belt off and set it going on a spin so just the motor runs and if you hear the clicking noise again then its the motor at fault.
If not then in the back of the drum is the heater which you will see.
Undo the 8mm nut in the middle and prise the heater out from the drum.
Then shine a touch in there and see if you can see anything in there. As they like to sit under the heater until its starts tuning the comes out and hits the drum which cause the noise.
If there is something in there then you can fish it out from the heater hole.
Then refit the heater and retry the washer and fingers crossed this has sorted it.
If you need anymore info just get back to me.