Dieseler Where do you get the grommet? I might be able to give that a try....
@Totallyhemp - if you're Ok using rubber washers and o-rings you can get them at Lowes, Homedepot, or most h/w stores. The grommet size is: 5/8" OD x 5/16" ID
The o-ring size is: No. 9, 5/8" OD x 7/16" ID
Or if you want vinyl, they're a bit more difficult to find locally but are available on-iine in bulk packs: Such as:
Grommets: 5/8" OD x 5/16" ID
http://www.amazon.com/Vinyl-Grommets-Bore-Diameter-D/dp/B0040D0QKM/ref=sr_1_13?ie=UTF8&qid=1324562702&sr=8-13
O-rings: 5/8" OD x 7/16" ID
http://www.amazon.com/Viton--Ring-Durometer-Black-Width/dp/B000FMUTMW/ref=sr_1_4?s=industrial&ie=UTF8&qid=1326328388&sr=1-4