Take a hint from the pro suspensions. Rycote uses silicon o-rings,
Sennheiser uses the regular black ones (Buna N). Don't pay their
inflated prices as these are just industrial products.
The largest silicon o-rings I have on hand right now are about 5"
diameter, but all materials are available much larger. Even custom sizes
if you are willing to order enough.
Silicon o-rings have the advantage that they don't stick to the mics in
places like my SASS as Buna N will do with time. They also don't crack
like the Buna N ones. They are not quite as abrasion resistant however.
Here's the place I get my o-rings, they have pages detailing all the
materials available from them, also a standard sizing system.
http://www.allorings.com/
I'm sure there are plenty of other places.
If you want to use bungee cord type material be aware that there are
different grades. Best would be UV and Sunlight resistant synthetic.
Available in bulk lengths down to at least as small as 1/16". It will
hold knots ok so any size can be made. I have some primarily (for sound
recording anyway) in sizes for rebuilding commercial suspensions. I got
mine at REI. Note that the bungee cord material can make noise under load.
In general don't set up suspensions so that your elastic is stretched
near it's limit. Use a little larger size if you find yourself doing that.
Walt
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