I have never had the need to do this before but I feel I must warn you about an unscrupulous seller, Prem Chainani of Prime Time Canada. I purchased a series of parts from Prem for an older model Breitling. Prem sent a series of incorrect (i.e., hands for a different model movement) and unusable (i.e., stripped chronograph pushers) parts. I contacted Prem about this and after much cajoling he agreed to send replacement parts (indeed, I have the email exchange). A month went by and nothing was sent. I called Prem and emailed him. No response. Now six weeks have gone by. I have left about a dozen emails and messages for him and haven't heard a word back. Buyer beware. I am out $250. Don't repeat my mistake.