Tell him you are going to play triplets and carry thru on that. To be contrary, he'll switch to eighths. Tell him you will continue to play triplets, but play eighths.EDIT:*one example: at the end of one of the ballads I sing, the rhythm is 4 descending eighth notes on beats 3 and 4-with a ritard-to a held whole note. He plays triplets against it. Doesn't really work. I've mentioned it-once. He doesn't change. Back to shrugging.
No, the 'wagon' was old when I took the pic in ~88; the 'horse' was an '87. Most likely scrapped by 2005.