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As a quick fix you can simply find the correct size stainless steel or brass bolt.

SP used 3 different sizes in their regs, they are:

5/16- 24 .............. 7/16-20.................. 9/16-18

3 SP yoke screws.jpg


Herman, would you double check the smallest thread size? It looks to be the same size as a low pressure 3/8-24 port plug while the middle is the same as a 7/16-20 high pressure plug. Indeed they screw right into the respective ports.

3 eights-24 & 7sixteenths-20.jpg
 
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Someone tell me when they find 7/16-20 bolts, please

Rob, I got mine from the hardware store.
 
Thanks Herman. I was afraid we were going to find out the hard way that a 4th yoke screw size was going to ruin our party.

At any rate, if the op still needs the middle yoke screw, I have it. AND we now know there are common size screws/bolts that will work.
 
First of all I want to thank everyone for their help! Work has had me tied up and unable to respond. I did get to a couple of hardware stores in town and no one carries brass bolts in that size. The screw is bent so it has to be a new one. I talked to my buddy in St Simons and got a definite maybe on another bolt. I do have a stainless bolt in the right size and a rebuild kit on the way from VDH, thanks Brian.
 
The screw is bent so it has to be a new one.
I have one, PM me with your snail mail address if you're interested.
 
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https://www.shearwater.com/products/perdix-ai/

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