Any
alternatives?

Seems like you should be able to get replacement parts through Delta.
I got a minor replacement part for a Dewalt router: reasonably
priced, and was able to pick it up locally - since Delta, Dewalt, PC,
B&D, and maybe others are all owned by the same group now, I assume
the process should be the same. Just google delta replacement parts -
the site is called ServiceNet. If you have your manual, or you can
find a parts diagram online (try the ServiceNet site or Delta's site),
googling the part number might help.
You asked about alternatives: My DP is too old for these new-fangled
things called gears (well, maybe not, but I think it is 1930's
vintage), so I added a pulley and counterweight system to help raise
the table. One pic available he
http://i181.photobucket.com/albums/x...g/DPpulley.jpg
There are also fancy ones available commercially that use a
cylindrical weight inside the column, but I went for simple and
cheap. I got inspiration and help from some kind folks he
http://facweb.furman.edu/~rbryson/dr...rovements.html
(second picture from bottom).
Hope this helps,
Andy