I use Solidworks for my day job, but also have some some uses at home. I do a bit of model engineering and would like to design my projects in Solidworks. Althought there are lots of standard threads for smart holes/fixings the standards I want are not available. I want to use BA sizes and also ME threads, also with the BA bolts I want some fixings with one size smaller heads (that is a 7BA bolt with an 8BA head size, for example). I'd also like to have rivets as a fixing as well as nuts and bolts. Does anyone know of a library (if that's the right term) for these type of fixings. Failing that how difficult is it to program in your own smart fixings and thread details? Is there a tutorial somewhere that I could work through. Sorry if my terminology is a bit off, but I don't realy have any use for these features at work -and I only tend to learn what I need to do the job in hand. (the new belt association in sketching is great fun though, and I dont really need that either!). Thanks Kevin