As there was a thread on here a while ago by someone looking for a replacement piston for a HW55 I thought I'd pass on a little discovery I made this afternoon.

These Weihrauch pistons are now obsolete, but by chance I realised that there is a readily available alternative if you can accept losing 2mm of stroke ?

The leather sealed SMK b2 piston body will fit with minimum modifications needed and is spot on in dimensions except for reducing the stroke a little and the need to use a TX200 seal and adaptor.

B2 pistons are available for £18.50 from Knibbs --- I bought one last week.


Hope this helps someone ?



All the best Mick