Recently changed drum on a Hotpoint WMUD962
Been working fine for 2 weeks ... then belt came off.

Belt is not adjustable .... and motor position also not adjustable
(fixed by drum mounts) Hence relationship of motor drive pulley to dram
pully is fixed.
The multi-vee belts when fitted will not stay central on the flat drum
pulley ..... I can fit central to drum pulley and vee belt is on the
first inner vee of motor pulley, but as soon as it rotates it jumps one
vee to the right. Still fully on the vee pulley, but runs with a belt
just on edge of drum pulley (not overlapping) ..... but presumably this
is why it came off.
I have ordered new belt anyway, assume existing belt may be stretched.

Anybody any other suggestions .... there seems to be no adjustment.