Just finished changing out 9 IV arms (new veins and skins) over the last three days.
The biggest tip I can share is to pour dish soap into the arm skin and add boiling water until about half of the arm skin is full. Let the heated, soapy water sit in the arm glove for a full 5 minutes before attempting to slide the mandrel in. It help to walk away, otherwise you may not give it enough time to warm the rubber fully. If the glove is not fully heated the arm mandrel will not go on past the wrist. Have plenty of towels for your work area, as water spillage is an issue. Also, use a small hand towel or washcloth to hold and work with the glove, as it will be hot to the touch. (Using a washcloth also helps give you grip against all of the slick soap.)
Again, be very careful of the hot water! It is possible to do this without getting burned, you just have to be aware of the liquid and pour some out as you get more of the arm in so you don't get soaked when it actually slides into place. When you get to the wrist, set the fingers in the proper place and work the glove down. Finish by placing the arm so that remaining fluid can drain out. That's it! You've done it!
Rural Health Sciences Institute
College of the Siskiyous