How do I add a HardWare wallet as an owner of a pool pledge?

Introduction

It is not uncommon to want to use a hardware wallet like a Ledger or Trezor device, with your own mnemonic phrase, for example, to act as the wallet for the pool pledge. Moreover, you can also use it to allow for multiple owners to pledge to the same pool. In some instances, some pool operators want a secondary wallet so that they have the main pledge amount in one wallet which they never touch, and a secondary "working" wallet with a small amount of ADA to use to sign and pay for transactions.

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