We may set up an oven, a stove, or millstones during [Chol] HaMoed.  R' Yehudah says: We may not roughen the millstones initially.

We may build a railing for a roof or for a balcony in an unskilled manner, but not in a professional manner. We may replaster the cracks and roll them [as if] with a roller, with the hand and the foot, but not with a trowel.  A hinge, or a socket, or a beam, or a lock, or a key that broke may be repaired during [Chol] HaMoed, provided that one does not plan his work for [Chol] HaMoed.  All pickled foods that can be eaten during the festival may be pickled [during Chol HaMoed].