Does anyone know what size of a nut will fit the outside threads of the suction cup device included in the 2007 parts kit and is it metric or standard?
It’s printed on the spec sheet that came with the suction cup.
Sorry I don’t have it with me, or I’de read it off for you.
we bought a G3/8’ tab
and will make our own G3/8" female nut to mount suction cups
this is a very special thread BSPP and was nowhere to find.
If anybody needs nuts, we could supply those for a small fee (material) and shipping reimbursement. jens
We bought these nuts at the local hardware store. They are brass compression fitting nuts for plumbing pipes. ANy plumbing supply store carrys them. Just bring the suction cup in and ask them to match the threads.
Pretty sure it’s M16x1.5. That’s 16mm diameter X 1.5mm thread pitch.
the thread is detailed on the spec sheet:) : G 3/8"
but you have to dig thru the web to find out it stands for G= BSPP
(BSPP) - British Standard Pipe (Parallel) Threads
for G3/8 - Threads Per Inch- 19 (!):eek:
see e.g. 404 | JW Winco Standard Parts
anyway we bought a special tab to "home make’ nuts - they fitt perfect and work great. we could send you some, let me know. 
JS