Those who wear tchailes because they are convinced that it is the real thing may face a serious halachic issue. The Rosh in a tshuva deals with the following question: how are we allowed to wear a four cornered begged in order to wear tzitzis, when by doing so we are also actively being m’vatel the mitzvah of t’cheiles?! The Rosh answers that since we don’t know what t’chailes is nowadays it is not considered being m’vatel the mitzvah of t’chailes.
Now if a tcailes wearer is called up to be the shliach tzibur and has to use the shul’s talis it would seem that he would not be permitted to do so , since , based on his view that today we know what tchailes is, the Rosh’s heter would not be available to him.
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