In the past @roryaronson always resent missing parts. This would take some time for shipping.
If you don’t want to wait you can try searching in a local hardware store or online.
For the record, we sent Matt replacement parts free-of-charge. For anyone else needing replacements, please email us at support@farm.bot rather than posting in the forum, as we need to collect shipping information which is best done in private. Thanks!