Progressive Automations did a very nice writeup on my projects. The article can be found here: http://www.progressiveautomations.com/PA-Blog/post/2013/12/02/Michael-McMasters-Got-an-R4-P17-In-the-Works!1.aspx
Progressive has been my supplier of high quality linear actuators for several years now, and has even sponsored our booth space at conventions. The products are top notch, and they have been very responsive to all of our needs. If you need actuators, this is the place to go!