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If you add the following code to your functions.php located in your theme folder, you will have a permanent fix for removing the trailing slash.

function psu_remove_product_trailingslash( $permalink ) {
return rtrim( $permalink, '/' );
}

add_filter( ‘psu_post_type_link_after’, ‘psu_remove_product_trailingslash’ );
add_filter( ‘psu_canonical_after’, ‘psu_remove_product_trailingslash’ );