Anyone have experience of fitting a new piston seal to a walther LGR rifle ?
Have removed to old one & purchased a new seal, but cannot get the seal to deform enough to fit into the piston recess. I've tried heating it in hot water to soften it & using grease etc but nothing seems to work.
Loathed to try putting it in the freezer as I've been told they get very brittle & would most likely break very easily.

Appreciate help & advice from anyone who has managed to change theirs in the past & also to save my hands from further punnishment.
Thanks.