Its OK that the cardboard/paper shell can spin. Its not actually part of the capacitor inside. Its just glued on.
That cap is part of the voltage doubler circuit; here is a suitable replacement that won't need the cardboard tube, but you will need a clamp to mount it, also available from the same site:
https://www.cedist.com/products/capacitor-jj-electronics-385v-220-f-electrolytic
All the electrolytic capacitors in the power supply should be replaced, else the power transformer is at risk!
There are other caps on that site that will probably work for the other capacitor cans as well. As a general rule of thumb, you can use a cap with a higher rated voltage and slightly higher capacitance. You can't go the other way!!
That cap is part of the voltage doubler circuit; here is a suitable replacement that won't need the cardboard tube, but you will need a clamp to mount it, also available from the same site:
https://www.cedist.com/products/capacitor-jj-electronics-385v-220-f-electrolytic
All the electrolytic capacitors in the power supply should be replaced, else the power transformer is at risk!
There are other caps on that site that will probably work for the other capacitor cans as well. As a general rule of thumb, you can use a cap with a higher rated voltage and slightly higher capacitance. You can't go the other way!!