I've not taken the Lotus ones apart because mine didn't come with them, but I have taken an aftermarket unit apart. The ones I have aren't that complex but they are usually designed to work in a specific orientation so care is needed to make sure they still do. Before pulling it apart I'd check the condition of the belt itself for fraying, edges etc.
Although I'm very much a "fix it" guy I'm with John on this, the mechanism has got to work when you need it so if you are even slightly unsure or put off by notices of "do not dissemble" then buy new ones. There are loads out there for not very much money, just check the orientation of movement for your application. I bought new and swapped over the fastening mechanism and inboard anchor points for the Lotus ones so at a glance it looks original, but with nice new belting.
Brian