My question concerns the correct way to punctuate a ruling found at the very end of the first perek of Beitza (in the Mishna). There, the mishna in question provides a list of items that may or may not be sent to people on a yontef:
Clothing may be sent, whether or not it is stitched together and whether or not it contains kilayim, so long as it can be used during the festival. A spiked sandal cannot be sent (cf: Shabbat 6:2), and nor can a shoe that has not been sewn together. Rabbi Yehuda adds to the list of things that cannot be sent a shoe that has not yet been dyed (מנעל לבן), since it requires a craftsman, at which point the mishna closes with the following principle:
זה הכלל: כל שנאותין בו ביום טוב משלחין אותו
How should this phrase be translated? There are two possible ways:
1) This is the rule: anything that may be used [lit. "with which one may derive enjoyment"], we send on a yontef;
2) This is the rule: anything that may be used on a yontef, we send.
The Bartenura adopts the first of those translations (as, incidentally, does Kehati and Danby):
ה"ק, כל שנאותין בו בחול כמות שהוא ואינו צריך למלאכה אחרת, אע"פ שאין נאותין ביו"ט, כגון תפילין, שבחול לובשין אותן כמות שהן וביום טוב אין לובשין אותן, משלחין אותן ביו"ט
Anything that may be used [lit. "with which one may derive enjoyment"] on a weekday as they are, and which do not require any additional work, even though they may not be used on a yontef (such as tefillin, which one wears as they are on a weekday but does not wear on a yontef), may be sent on a yontef.
To me, this interpretation is problematic, given the example in the mishna of the spiked sandal. This is an item that can be worn on a weekday, just not on a Shabbes or a yontef. If we adopt the first of those two translations, as the Bartenura does, then how do we explain the prohibition of sending spiked sandals but the permissibility of sending tefillin (which also cannot be worn on the yontef)? Does it not make more sense to adopt the second of my translations, and to derive the permissibility of tefillin and other items from something else?