Every week we work through a practical design, sourcing, manufacturing or compliance problem and explain the evidence that points to the answer. Reader submissions can be anonymised before publication.
Describe the design, sourcing, manufacturing or compliance problem you are facing. You may attach supporting documents. Submissions can be anonymised before publication.
Use the email subject as your problem title, describe the issue and what you have already tried in the message, then attach any drawings, photographs, logs or specifications. Please remove confidential information before sending.
Email your problem and attachments
