Got my 1229 in 1973 for my college dorm. It is still in use. Early on, I got a kit of Dual approved lubricants and have kept the unit in mint condition. About 8 years ago I gave it an overhaul, replacing the main elastomers, including the steuerpimpel and collar from the arm pivot raise/lower mechanism.
Original cartridge was a Stanton 681EE. This was followed by ADC XLM, XLM MkII, ZLM and Shure V15 Type VMR. Today, the Shure wears a JICO SAS stylus.
I have other Duals including a very good performing 510, but the 1229 will last forever.