Joe: The old style Maglite barrels were discontinued in 1992 and the new switch assemblies will not work in the pre 92 barrels. I have an old switch but you would need the proper tools to replace it as long as there is no battery corrosion in the barrel.
Don Keller
I offer parts and service to all generation Kel-Lites. Some lights available for sale. I also offer some availability for Maglite parts and service. www.kellite.com
Don Keller