pushing render into gaps

hi guys, i am wanting to push render into a gap that is about 15 cms deep by 1 cm wide by about 50cms high. Normally the width is a lot bigger so i have generally just sat there with paint scraper and despite making a crapload of mess on the ground, i was able to fill the gaps.
but with a 1 cm width, i am going to struggle to scrape the render into the gap.
Is there anything home made that might work to push cement render into a gap.
I was thinking the flat narrow extension you normally get with vaccuum cleaners is or could be made to be about the right width with a bit of heat to allow me to pump the render into the gap, but i don't know if it would actually work or not (due to requiring a lot of pressure to push a not very fluid fluid through such a small gap) and what i could use to actually pump the render into the gap to fill all the empty space (like say using an enlarged syringe or bike pump to force the cement down the tube)
does anyone have any suggestions on what i could construct to pump render into such a narrow width space?


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