David Purdie   F.Inst.C.T
President - Reverse Engineering Solutions (US)
Managing Director - InvisiTech Ltd (UK)


Customer service

David Purdie has always believed in providing extreme customer service, with good communication and prompt reliable service.

WHAt we do

  • Free Assessment of your issue
  • Free fixed price standard quotation
  • Shared Costs on complex quotes
  • Preparing Drawings specs etc.
  • Running Project with feedback 
  • Providing first item for Inspection
  • Producing the production models
  • ​Ensuring 100% customer satisfaction


We solve issues of obsolescence by reverse engineering - including all necessary paperwork.  This includes upgrading to allow more modern material and processes.

With over 30 years of experience working in military and aerospace electronics, to drawings, specifications and to our own QAM.


If you have machinery of any type that is:

Beyond economic repair,

There are no spares

OR in some other way is destined to be scrap...

You have come to the right place. We find the perfect solution every time.

When you are maintaining older equipment you are generally facing issues of material availability and production quantities.  With today's solutions there are newer and better materials available, more manufacturing techniques to ensure success every time.  It's just knowing which material and process to select.

David Purdie has a history of over 30 years of international solutions to obsolescence using Reverse Engineering, and has presented at many international gatherings.

We offer the perfect answer to maintaining equipment that offers reliability now and sustainability for the future.

Many of the parts I have designed, are still being re-ordered and used as spares over twenty years past the time the engineers thought the equipment to be redundant.

With our quality, and guarantees you can be sure that this is a wonderful investment to ensure your essential/desirable equipment is kept in tiptop shape for years to come.  

In doing this work for over 30 years, you can imagine that we have been asked to reverse engineer (even if that term is not used) every possible type of engineered item from ancient PCB assemblies to hydraulic valves, electronic components (IC's resistors etc) to communications cables and boxes.  There are few limits to our work, and they are software and on-board computing (we had to draw a line somewhere).

So why not call today for a FREE discussion and fixed price quote... this will move you forward, from here to the future of trouble free operational support.  Take a look at the projects page for more examples.

We will reproduce any part or assembly that is now obsolete or in need of upgrading.

  • Reproducing PCB assemblies and bare boards
  • Any mechanical part, moving or static
  • Hydraulic/Pneumatic parts, valves, connectors or pipework
  • Cable Assemblies and panels, power supplies and control boxes

In short - if its ever been made before - we can reproduce it today, in today's materials and today's quantities.

Our experience will show when you see us looking into the items long term servivability and sustainability - thinking of the environment and condition such as temperature, humidity, vibration and shock.

Do you support any type of vital equipment?  

Do you run out of spare parts?  

Have big problems finding obscure or obsolete spares?  


Reverse Engineering Solutions: Can solve these distractions for you, allowing old but otherwise excellent work horses to be serviceable for years to come.

What we can do for your company