Was about to throw away some victa primer caps with split primer when I decided to have a fiddle
Drilled out the vent hole, and tapped in a retic fitting and fitted a piece of pvc pipe.
Then got a line trimmer remote primer with broken retainer leg, drilled a hole in the top, drilled up each hole to dislodge and break the duckbill valve, soldering ironed one fitting shut. works great
Should go nicely on the VC sport (will put a good piece of line on and put in an inconspicuous location
If you had one with a deck fitting for the remote primer, I suppose you could use one of the talon 4st mower primers
https://www.outdoorking-forum.com.au/engines/talon-engine-parts/genuine-talon-fuel-primer-522-26-97-01Someone has probably thought of before, hopefully it saves a few primer caps