Original Diana 35 - elastomer piston seal ? Better?

[jonnyone]

Thanks Dave.

Probably you converted a Diana 35 or 50. If so, do you remember if the ptfe seals you used were shorter than the originals?

I ask because the seal I am looking at is shorter, and I was told this will cause trouble.

Ignacio

Morning ignacio. I have fitted ptfe seals to two Diana 45s, one 50, one 50T01, two anschutz 335s, one HW35, and a BSF as I recall.
I have been fortunate in that despite the seals being thinner height wise than the original leather seal they have still had clearance between the cocking lever rod and the piston body. This can easily be checked after the seal is fitted. A few millimetres clearance is needed when the piston is fully pushed home against the end of the compression tube. Should this not prove to be the case then the new head will need.packing between it and the piston body to create that required gap. I recall some have used large tap washers in the past but as I say it has proved unnecessary for me. I can't say it will be the same for your gun as I have no experience of working on a 35.
Perhaps an email query to the seller of the synthetic seal may throw some light on things but even then I would still check the clearance as per the above after fitting?
Wish you luck
Dave