Get the bloody hammer out and hit it !!
The whole point of old skool build (well for me) is getting your hands dirty agian and DIY.
I always was taking my bike apart and rebuilding it, never got anyone lese to do it, wheres the fun in that.
There are plenty of places to get old skool bits including ebay.
If you get a shop to do it, you might as well go and buy a new one.