Blackburn track pump - replacement head?

Is it possible to get replacement head parts for a blackburn track pump? Think I've got an AirTower 1 and I strongly suspect one of my delightfull offspring has unscrewed the top part and lost something from it as it no longer locks on so isn't doing its job any more. As its a rubber / squeeze type head which could get damaged over time anyway, thought that there might be a replacement readily available, but with blackburn making many different types of heads I'm not sure I've found any which would fit my (basic, entry level) pump.
2015 Canyon Nerve AL 6.0 (son #1's)
2011 Specialized Hardrock Sport Disc (son #3s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
2011 Specialized Hardrock Sport Disc (son #3s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
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In other news, discovered the hidden extensions on my blackburn pump tonight (e.g. football needle, other attachments etc) hidden in the handle - didn't even know they were there!!
2011 Specialized Hardrock Sport Disc (son #3s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build