[DIYbio] Can't find supplier for ~1 inch Viton stopper

looking to make a vacuum container wire feed-through, thinking I'll
drill a hole into an existing aluminum blocking plate (maybe with a
chamfer/angle to it), shove some piano wire through the stopper, then
shove that into the blocking plate and pump down. Maybe I'd extend the
existing blocking-plate screws and screw down a clamp on the stopper.

But I can't find a supplier for these. The closest I've come is this
list (personally I think I'd pick the sphere out of any of these, as
it seems like it'd seat more like a stopper in the hole):
$5.46
3/4" inch
Viton Fluoroelastomer Sphere, 70A Durometer, Precision Ground Finish,
No Backing, Black, Inch
http://www.amazonsupply.com/dp/B00CCGYHZO?ref_=sr_1_9_txt

$45.62
1 sq ft of 1/8" inch sheeting
http://www.amazonsupply.com/dp/B0075ZN4RE?ref_=sr_1_2_txt

$7.09
Stopper that is questionable as to whether holes come as-purchased:
http://www.amazon.com/Universal-Stopper-Viton-Synthetic-Rubber/dp/B0011Z90P4/ref=sr_1_1?ie=UTF8&qid=1406519692&sr=8-1&keywords=viton+stopper

$24.90
VITON RUBBER SHEET 1/8" THICK 6" X 6" SQUARE ACID CHEMICAL HIGH TEMP
http://www.ebay.com/itm/VITON-RUBBER-SHEET-1-8-THICK-6-X-6-SQUARE-ACID-CHEMICAL-HIGH-TEMP-/200891967372?pt=LH_DefaultDomain_0&hash=item2ec618278c

$6.50
1 Gasket 2in Disc 1/16 Thick Replacement Viton Rubber MadeBy ElisGeneralStoreLLC
http://www.ebay.com/itm/1-Gasket-2in-Disc-1-16-Thick-Replacement-Viton-Rubber-MadeBy-ElisGeneralStoreLLC-/251595451636?pt=LH_DefaultDomain_0&hash=item3a9441ecf4

(I also found some someone on youtube or something claiming to have
made some viton stoppers in a small batch and had some for sale, but I
never
heard back from them)



--
-Nathan

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