I have an old Sun machine that can be used for this. Have had it since it was nearly new. Got it when I was a kid. Most have been traded in over the years for newer stuff. You could expand your search to include Marquette, Allen, Bear, Snap On, etc. The big problem with older Sun equipment is deteriorated wiring. The insulation just crumbles. For most exhaust leaks in diesels I use the wet rag plugging the tail pipe method. Any leaks show up real quick.