Combining Bead Types

[shilala]

Absolutely use the HF and HCM beads together,
Tsolomon nailed it.
Even when the HF beads turn to brown crumbs, they'll help keep your HCM beads steady.
The HF beads are by no means necessary, so when they get all nasty and stinky, get some new ones.
That's just my opinion, I like to keep the motor clean.