M8 exactly the same as 2 I have here.
I think there a 2 issues with them.
1 the motor
pulses(
tm) which causes the whir and secondly I think the central shaft bearings may be a bit worn hence the sudden "new" clunk.
I have 2 Halo's here plus 1(nearly new by the looks of it)I had access to and I tried whilst I was away from the forum earlier,also a brand new motor.
I stripped my Halo out
again because the post bugged me
.
Now,the new motor and the "new-looking" Halo have the motor pulse/whir,but the other 2 have the whir and the clunk,and more movement in the rip drive shafts.
The shaft runs 2 bearings,quite possibly the bearings are a little worn.
Don't worry..(or sell it to me cheap as it's fkt...£15
)...