Burnston, first of all, welcome to the forums, man!
There are a whole bunch of very knowledgeable folks that hang here.
As to your problem, instead of changing the front sight, why not change to a shorter rear sight blade instead. It's much easier and cheaper too. Your model 29 came with a .146 height rear sight blade from the factory. S&W also makes a .126 rear sight blade that can simply be swapped in place for that .146 sight blade that is presently installed on the rear sight base.
Smith & Wesson has a .126 blade kit for sale for $11 and includes the screw and nut, which will need to be replaced with the blade change. You can buy the sight blade kit and bring everything to your gunsmith and have him swap them out.
Here is a link to it on the S&W website:
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