Scuba Pro G250 and R109 questions

[buddhasummer]

I'm not going to make a specific advertisement for conversion kits as I'm not sure it's worth the effort but if anyone wants one just message me.

 

[axxel57]

No, I'm very sure that those diaphragms are original SP, I have seen them pretty often, but only in black.
The one on the first photo is the first I found translutioned, but that is probably not so surprising looking at this particular G250 body.
On the photo below you see one G250 as I normally know them from the first and, I think, 2nd generation

......

 

[Umuntu]

Intuitively, it makes sense that a thicker/stiffer diaphragm would require more vacuum effort to bend than a thinner, more flexible diaphragm.

 

[Couv]

Yes, I've seen those knobby diaphragms (black) in a few SP regulators. A quick glance at the part number confirms it is indeed SP.