13mm hex head, 8mmX1.5 threaded, 1/2" (13mm) long will do.  A copper or
fiber washer under the head for sealing purposes.  Lowes or HD will have
it.  HF sells a nice assortment of copper washers for a few bucks.

Mike B.

On 12/13/2012 11:39 AM, Alistair Bell wrote:
> Mike,
>
> I apologize for leading you astray a bit, I just noticed that the bolt you have has unthreaded portion under head (must be a fairly long bolt eh?) so cutting that one short would not work. You should be able to get the rights sized, fully threaded bolt at the HW store.
>
> good luck
>
> alistair
> On 2012-12-13, at 8:34 AM, Mike South wrote:
>
>> Thanks Alistair--I had thought about just cutting it but I didn't know what it would do to the bottom of the threads.  Not that I know if I have an M8 1.25 nut but I can get that when I go out today to try a actual hardware store (last night I just went to the two home improvment stores that are right next to each other and it was too late to go anywhere else) and see if I can get an exact match.  If not, I'll go with the hacksaw method.
>>
>> I hope this list is still running when the zombie apocalypse comes.
>>
>> mike