Mark II #2

[Methuselah]

Better condition than the 1st one, appears not to have been used much.

Mashed the button on piercing cap, doesn't feel right, so took it apart and changed the o-rings. Outside one broke into 3 pieces, inside one closer to crumpled to dust. Driving that roll pin out is a chore! At least this time I knew to not drive it all the way out.

Found out 400 grit sandpaper is not your friend, even after follow up with crocus cloth there were minor grooves on the pin. Minor.

Too soon to tell if it leaks but I don't hear anything. Low power fps was 384.7, 362.6, 364.8 and high was 469.7. 468.2, 460.2 with 7.4 gr. crosman pointed hunter.

One shot close range was dead on. Tomorrow I extend that range and hopefully remember to add some pics.

[Matchstickshooter]

Better condition than the 1st one, appears not to have been used much.

Mashed the button on piercing cap, doesn't feel right, so took it apart and changed the o-rings. Outside one broke into 3 pieces, inside one closer to crumpled to dust. Driving that roll pin out is a chore! At least this time I knew to not drive it all the way out.

Found out 400 grit sandpaper is not your friend, even after follow up with crocus cloth there were minor grooves on the pin. Minor.

Too soon to tell if it leaks but I don't hear anything. Low power fps was 384.7, 362.6, 364.8 and high was 469.7. 468.2, 460.2 with 7.4 gr. crosman pointed hunter.

One shot close range was dead on. Tomorrow I extend that range and hopefully remember to add some pics.

Seal the pistol up in a gallon Ziplock freezer bag and you'll know for sure if it leaks.
 Keep the bag rather flat when you seal it. it will inflate if there's a leak. 
 
 

[Methuselah]

Very good suggestion Wendell, it's been a week and I fired it once today.  Still holding pressure...

[Methuselah]

2 weeks, still holding. It's calling me louder ... 

[Methuselah]

Finally shot it empty a few days ago, going to call it good. Cartridge in the first Mark II mostly shot daily one time on low power had the cartridge put in on the same day is still shooting - good deal!

A third Mark, this one in .22 just got the cap resealed, leaked before toggling to piercing position, hissed more when toggled, and doesn't discharge when the hammer hits or is pulled against the valve stem. I don't think it leaked down completely, so going to wait maybe a week or two and open it up.

I'm thinking new thread and I'll add some pictures.