New VM-68 or PMI 3 Hammer Oring, cut from urethane sheet, new one included. These came from Chris Mader at VM68.com. These are new but are cut from sheets rather than case so the edges are flat not round. Users who have used these orings tell me they work fine but Chris Mader did warn me that some users have had problems sine the edge is not round like the originals.
Chris wrote me:
'' I do need to point out that they are not factory original style orings.
The ones I had made were die cut from sheets of urethane and are a close approximation to the originals.
Some people did email me and said they had problems with them working. This is probably due to the fact they have a square edge on them rather than a round edge.
If you keep them well lubricated (a heavy grease seems to work best) they seem to hold up ok. Unfortunately they're not as low maintenance as the originals but they're better than nothing.
These are sold as is and one is included. The Brown oring in the comparison photos is a well used stock vm-68 ring and is not included and only shown for comparison.
Talking to Smiley Burke, who runs a large squad of VM-68 explains some of the issues that Chris Mader originally explained to me with these hammer orings.
"Outer Diameter is slightly wrong. Press cut plastic gives out. Original hammer orings have a round surface. Because these are press cut they are concave. Durometer is too soft. Need to be 90 minimum."
He goes on to explain that In hot weather they are okay but you'll have issues with hpa.