I still have the vacuum type in my 54. The electric works well and is consistent in motion were the vacuum type may slow down during acceleration. Mine was slow and I took it apart a couple of times to lube it prior to getting a state inspect so it would work. If you can get a repair kit and it is reasonable I would try it. I searched but couldn't find one. I eventually got a reconditioned motor from Jim Carter (
www.oldchevytrucks.com) and it works great. With the new motor I did find out that I needed tighter arm springs when the blade shot across the garage. But taking it apart is a bit of a trick without the right tool. Get an old screwdriver and cut the tip off and then use a dremel tool or other small grinding blade to cut a slot in the end of the screwdriver shaft so that it fits over the top of those screw heads. Once opened there is not much to the inside, just watch the spring and rocker arm under the side plate so you don't lose them. Take it apart over a big white towel, preferably one that you wife won't miss. You may get lucky and all you need to do is clean or change the sponge filter in the unit.
Good Luck, have fun and don't rush it. Mine has been a 25-year project so far.
