Well, let's take the example of the MSR Whisperlite. With a Whisperlite, it's really no problem if you've got an MSR Espresso Star.
|An MSR Espresso Star|
|An MSR Espresso Star on a Whisperlite Universal|
|An MSR Espresso Star on a Primus Omnifuel|
Now the bad news: These are now available second hand only (eBay, Craig's List, etc). The MSR Espresso Star is a nifty little gadget, but apparently it didn't sell well enough to be retained in MSR's product line up. Having struggled with jury rigging an espresso maker on my winter stove, I was delighted to find one on Craig's List. Search, and you might be able to pick one up too.
Thanks for joining me on another Adventure in Stoving,
Technical Appendix -- Weights
MSR Espresso Star . . . . 19g/0.67oz
|The MSR Espresso Star|