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The problem even with the correct old school BPs is they will ride up so the top of the BP is even with the shoulders reguardless of how the straps are adjusted. They look fine on land but move all over the place under water. To compensate for this, the tank must be kept very low OR you need to...

If it's a complete non-mag it is something you could rebuild but I wouldn't. Without the hookah ports it's a bit of a pain to set up and does not allow you any LP accessories, not a problem for vintage divers but you may want them. The HP parts are gold plated, removing them hurts is value but...

It appears from the photo, the reg is way too high up on that BP to dive properly.

I never saw the big deal of DIN tanks but that's another thread. The later AK or later Phoenix are your only options for a DIN DH or as tbone said, use a valve adapter. You also have a second problem, DH regs (except the AK or Phoenix mod) do not have any way of monitoring your tank pressure...

Which one are you rebuilding? The Delux or the Gold Label? If you are rebuilding the Gold Label, it is a really great breathing reg but is touchy to get right, it has a sweet spot that can be tricky to find. It goes from breathing good to great then back to good with just slight adjustments

The hose loop is most likely no where near good enough to dive and you will need mushroom valves for sure. USD hose loop components work well on the HW, you can get them from the Scuba Museum or VDH..

Since time is going the be short, I would suggest a few different regs. I see no need for a a bunch of flow thorough pistons (Mk-5/10/25/ Atomic) since they are very similar, rather pick a common one (MK-5) as an example. I don't see a simple flow by piston in the mix (Mk-2) so one of those is...

Not a problem, I need you to look at some compressor stuff anyway.

The guy has no clue what he is talking about. "He knew a guy who had a one of those regulators" at least indicates to me he has never actually had one in his hands, just going off rumors. There is always someone who hates any product for whatever reasons. I helped with the development of the...

Not sure the size but backup orings are not hard to find. McMaster has them for around $3 for 100. I would try asking on VDH, good chance someone there has a bag of them. I have a service manual for the Calypso if you need one.

Troubleshooting from a distance is difficult at best but we need a bit more info just to get close. What exactly are you calling a free flow? A very slight leak or a full bore flow of gas, they are very different but are both technically free flows but are very different. We also need to know...

Not necessarily, it also depends on the refresh time, lower end instruments are too slow to catch moderate speed transients much less quicker ones. Even with a max hold function, the refresh rate may (will likely) be too slow to catch what an analog gauge would show you. Case in point, put an...

I have not used one but experience with voltmeters tells me I would not like it. For accurate steady state measurements, I love digital equipment but when the measured value varies a lot fairly quickly most digital equipment just doesn't cut it. Nor will it show you rapid transients that an...

Now to set up the HPR. It can be tweaked a lot to improve the performance. With the reg under pressure connected to a 500 psi tank (to keep IP at max), adjust the adjustment nut until there is a slight amount of free play in the lever. The lever should rise as you do this. Continue to adjust...

Tiny leaks around the nozzle gasket and the hookah port are not uncommon but over 18 hrs I would not worry about it. Odds are you may do more damage than good on such a small leak.

Lights and strobes are a prefect examples of "static but not really static" seals, thank you for reminding me of those. The friction issue on these is easy to see and feel but the exact problems on a smaller scale are happening on port plugs and hoses.

My favorite oring discussion.:) It's true static oring don't need lube, trouble is there is a big misunderstanding of the definition of what a static oring is. Most believe that once it's in place and does not move (or the parts around it) while in place it's static, the rub here, if you...

Nice article, orings are an interest of mine. I'm one of the nerds who has read (most) of the Parker manual.

The DAAM is unbalanced. I did not see any DA seats either. He use to have them, may have sold out and removed them from the store.

It is possible to lap the HP seat or VDH has reproductions, I would not buy old stock unless you just "have" to keep it OEM. This is how I polish them. You will need a flat surface and some wet/dry sandpaper. A pane of glass works. I use a 12x12 ( 305x305 mm for the metric folks)ceramic...