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Try calling or e-mailing other agencies and speaking to someone about the possibility; if you like to fly by the seat of your pants, you will probably find it fairly easy to find somewhere in Negombo (the epicenter of private transport rentals for the country) that rents tuk-tuks.
According to this interview with another couple who toured Sri Lanka by tuk-tuk, Alma Tours in Negombo, appears to offer tuk-tuk rental as well.
In any case, literally anyone in the entire country can help if there is a problem, and Rocky assured us that he would come and take care of anything that happened, anywhere, within 24 hours.
Ultimately, we were immensely happy we decided to rent from Rocky and, for the most part, the entire transaction was smooth and worry-free.
As it happened, an in-line gas filter had failed, and it was quickly and easily replaced by Rocky before we signed any paperwork or paid any money.