Compressor Valve Modifications/alterations

A)I need to change a small part of a cartridge already designed. Design is already made and STP files created.
estimated 1 hour work.

B) Next, update a valve design that requires modifications in size. estimated work 2 hours

C) Lastly, need to create 2 valves from existing templates, these valves will need a "unloader: device designed into the valve. estimated time 3-4 hours.

I chave all the cad files and drawings ready to send. Looking for people with good CAD engineering experience and similar portfolio.