I have one those, its the uk version of the Atlas if memory serves. Stronger/wider castings but full of plastic parts.

There should be a roller bearing on each end. They will slide of but are press fitted to resist centrifugal force so take some getting off, you will need a puller or carefully beat the crap out of it with brass drifts. (not ideal)

If you don't need to take them off then I would leave them alone. I had to on mine because the main gear was damaged.