I just ordered one of these. I haven't received it yet but I talked with the guy a bit and he also uses it on his pinball machines as well as other things. It's a complete solution for 1/8" tubular rivets used on almost all ramps out of the box and much cheaper than anything else I could find.
I can't vouch for it yet, but it looks promising and the price was right.
ebay.com link: Tonka Semi Tubular Rivet Tool Dies Rivets 1 8
<sub class="mdrtd">Post edited by Tekman : Forgot link</sub>