@Nick_S I have an SKS Rennkomplainer and I hate it. I sold the EVA head because it doesn't fit. It's the Renn I've got the Zipp crack pipe on.
The Silca looks exactly the same as the Zipp. I assume they're the same so I might be able to use the replacement Silca elastomer in Zipp. But I still hate them. I've had two Hirame copies in the past and they're too big from memory which is why I swapped to the Zipp.
It sounds like you have pretty much exhausted the options. Maybe just fit the new rubber to the Zipp and move it to another model of pump, e.g., Lezyne?
It looks like the Silica is the same thing and its rubber replacement is £12 (bastards)
Twitter suggest Hirame and Tekno but I'm sure I used to have these style heads and they didn't fit - maybe people are using shorter valved tubes than me? I'll have to revisit.
@Nick_S I have an SKS Rennkomplainer and I hate it. I sold the EVA head because it doesn't fit. It's the Renn I've got the Zipp crack pipe on.
The Silca looks exactly the same as the Zipp. I assume they're the same so I might be able to use the replacement Silca elastomer in Zipp. But I still hate them. I've had two Hirame copies in the past and they're too big from memory which is why I swapped to the Zipp.