There should be alu, copper, brass ones and various length and diameter. May be alu is easy to use. And buy these rivet snap (not the simple punch. snap has negative spherical shape at the top) which should be suitable size for the rivet.
To use it, you need solid steel round bar or equivalent slightly thinner than the head tube but long enough so that you can fix the bar with vice or, steady table with c clamp.
Put the rivet from inside the head tube, through the badge, put the head tube with the bits through the steel bar and rest on it. SO that the rivet is pushed against the steel bar. Then hammer the head of the rivet with the punch, till the head become round like mushroom, and secure the badge.
You ve got hammer very carefully and slowly so that you don't damage the badge.
I recommend to do a test before you try on the real.
Hope I m making sense.
If you are on a budget, simply buy alu bar or equivalent in desired diameter, cut it short, hammer it to make your own rivet and use it.
That's called 'split pin' use to clip soft material but good idea.
If you want more secure fix, use solid rivet(but much thinner) like this.
http://www.sapphireproducts.co.uk/4620t5.htm
There should be alu, copper, brass ones and various length and diameter. May be alu is easy to use. And buy these rivet snap (not the simple punch. snap has negative spherical shape at the top) which should be suitable size for the rivet.
http://www.toolshopdirect.co.uk/shop.php/tools/Priory
To use it, you need solid steel round bar or equivalent slightly thinner than the head tube but long enough so that you can fix the bar with vice or, steady table with c clamp.
Put the rivet from inside the head tube, through the badge, put the head tube with the bits through the steel bar and rest on it. SO that the rivet is pushed against the steel bar. Then hammer the head of the rivet with the punch, till the head become round like mushroom, and secure the badge.
You ve got hammer very carefully and slowly so that you don't damage the badge.
I recommend to do a test before you try on the real.
Hope I m making sense.
If you are on a budget, simply buy alu bar or equivalent in desired diameter, cut it short, hammer it to make your own rivet and use it.