Try Larry Baker at:
blackpowderspg.com
As I recall he used to list a pipe clamp stand similar to the pic you posted. I've been using one for years. An essential piece of range gear IMO.

I have a homemade one I use. Basically it is a 3/4 brass pipe T. I bored out the long way so it would slide easily on the 3/4 pipe, drilled and taped a hole for a clamp screw, put a padded 6 inch 3/4 pipe nipple in the remaining threaded portion. Works great.
Mike

Gerald, 

I don’t know what tools you have or have access to, but 30 years ago when I made mine, I used an aluminum bar about 6” X 2” X 3/4” thick. Drilled a hole for the pipe stand at one end, then drilled the other end for the top section of a Freeland’s scope stand (the old style). For my powder measure to clamp to, I used a slightly smaller bar and just drilled it once for the pipe stand. Both plates had holes drilled and threaded for locking screws to hold them in place on the pole. 

Finally, I took a T junction for the pipe stand and bored it through for the pipe to slide then screwed in a short section of the same pipe and covered it with foam insulation.  Of course I was fortunate to have access to Charlie Dell’s shop back then, making it much easier than what I could do today.

Froggie

Here is my short one that uses 1/2" pipe and pony clamps.  You can get PVC threaded pieces that are 1/2" ID and screw into a 3/4" pipe coupler or 'T'.  This one uses an eBay window mount head that clamps on a 1/4" tick aluminum square.  I have another that uses a 'T' that is drilled for a 1/4 hole for mounting a tripod head.  It is longer and has another 'T' at the top that is padded for an offhand rest.

Jack

Jack

Damn...you caught me asleep at the wheel. I can get you another closeup  of the table mount .Have built two like this.
Pipe clamp,black pipe polished on lathe (to look cool).A Bogen Manfrotto 3030 head,find em on Ebay used for pretty cheap. The aluminum square 2x2x3" high I bored on mill. Pete

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Some pics.Nice thing with the Bogan,you get a base to attach to scope for quick release and A lock so it cant fall out of mount...

Thinking about it and comparing the results to my 60 years of experience with camera tripods, thin pipe has to be about the worst thing you could use for a stand. A very gentle tap with the tip of your finger will set off a vibration that will continue for a long time. Of course, wind will cause the same vibration to begin and perpetuate. The best material for one of these stands would actually be wood.

Thank you to all that have helped mw track down the components needed to us the standard pipe clamp securing the scope and rest. 
I just placed my order through the SPG website and once the maker has his shop set up and running orders will be fulfilled.
Thanks again all.

Gerald

Never had that problem ,just crank it down Tight.I used thick wall pipe,its as sturdy as you would want......

Skalkaho wrote on Feb 26^th, 2023 at 11:03am:


Pete, as with all things I'm sure you have the absolute best. But it doesn't have anything to do with quality but rather the relief on the side of the bench and the length of the pipe clamp jaws, If your pipe clamp jaws are to short you have to lean the clamp over to get a purchase. But this throws everything out of wack and the pipe clamp will often just pop off.  

I'm talking about the short cast iron pipe clamps that I and most of us poor people use, not the best highest quality that Pete uses.  I'm sure your jaws are long so you've never had the problem. 

Pete, I made a very rough sketch so that you might understand what I'm talking about.  If it makes no sense to you at first just keep trying. It will come to you.  

A cup wheel would do it. Or add extensions to the clamp jaws.

that thing would really sell at gun shows if it was lighter weight- and chromed

p.s. it could use a cup holder, too

Why is this thread in "Single Shot Rifles" ?

You got it Pete!  Good for you!  If you would travel around and shoot at different ranges you would realized that some benchtops have a lot more relief than others.   
No, I went to a tripod for my spotting scope. Way better.

Mine has a top mount that can be rotated up to ninety degrees and lean over onto the bench where I can view it easily. I don't always like to use that if I'm going to be up and down in the chair often. Busy days at the range can create that situation. In that case, I just do the 'lean' like you, Vall.
Basically, it's just a matter of what model of tripod you are using. Mine is a pretty good one that I got from a fellow who was moving.

To each his own. I like to pivot the head in for benchrest shooting and its close in,I shoot ,cock my head and mark my shot thru scope.Then pivot scope base all the way around pipe to outside left,reset scope raise it up to eye level  for offhand. I can shoot then cock head A couple inches and mark my shot. Whatever works for you,at least guys can see pics of different options and use what fits them.Isn't that what this Forum is about?