You are quite correct about the spring type couplings, they are much cheaper. The 1" Oldham ones cost me, in your money, about $30 for each complete one. But I always look on them as being good insurance, never need to be looked at again.
If you follow the link I gave to Arc Euro, on that first page, it gives the general sizes of the component parts for each size OD.
If you don't try it, you will never know if you can do it!!
Last edited by Blogwitch; 06-06-2016 at 01:23 AM.