Model 52-2 trigger

My model 52-2 trigger pull has dropped to 1.75 lbs and the hammer block is VERY hard to activate.   Next month I will be doing a detailed strip to repair these conditions.  To speed the tear down/rebuild process I have purchased the below listed springs from Numrich.   I am very familiar with 1911's but not the model 52-2 so I have a couple of questions before I start.
1.  Are there any other parts that I should be replacing? 
2.  Is there anything else that I should be looking at while it is torn down?
3.  Are there any special tools required?
Doug

PARTS I WILL BE REPLACING
Sear spring retaining pin
Trigger plunger spring
ejector spring
firing pin spring
magazine catch spring
mainspring
Safety plunger spring (used)
Sear spring
Ejector depressor plunger spring
drawbar plunger spring

I tried new coil springs to no effect and bent the sear spring to get the weight up. Next time I will modify a thicker sear spring from another S&W model to try to get the weight up above NRA International CF.

Sa-tevp wrote:I tried new coil springs to no effect and bent the sear spring to get the weight up. Next time I will modify a thicker sear spring from another S&W model to try to get the weight up above NRA International CF.

I am concerned that the problem might be wear on the sear and/or mating parts, but I thought I would try springs first.   You mentioned a heavier sear spring.  Do you know of another S&W model that has a similar spring? 
Doug

I am not sure what is a drop in part but I would look at S&W M39/59 or maybe later target Gen 3 pistol sear springs.

I have heard rumors that S&W had a stiifer sear spring for International CF but I never found a part number.

if you go to the Smith and Wesson forum and post about your 52 in the Semi Autos section, there is a gentleman on that forum that is likely to chime in who used to assemble 52's back in the good ole days.  I thing his user name is donk52.  Mike Myer's on this forum had a running conversation with him about a 52 that he was trying to few months ago.  I believe he gave Mike good advice!

I had posted a while back that I cut some rubber pieces out of an event bracelet and put them in the frame well in front of the trigger bow to raise weight. It gives a 2nd stage effect. I also stretched the coil spring in front of the tgr bow. Regards

try the sear spring first, it's easy to do.  I had the same issue recently and changed it to what seems to be a thicker sear spring that I found in a box of old 52 parts that my father had.

Trigger weight went from 2lb. to 3lb.