They will let you borrow a non-programmable basic calculator.
Since meeting with the sponsor would not necessarily resolve the issue because you have not heard the concerns of the negative stakeholders yet, your initial step would be to include the manufacturing personnel as project stakeholders.
A few days ago, I received an email from a visitor to my blog.
Interestingly measuring the vision can be an innovative exercise as given below.
Project managers use this analysis to plan for risks based on the actual cost, schedule and progress of the work.
They also have a 90-day money back guarantee, so you can get a refund if something goes wrong.