Fitted hand/spring in my Colt but indexing not perfect suggestions please

[Sundance]

Well after 3 hrs of trying to match the old hand nearly got it right.  BUT sometimes the cylinder will not lock up.  Cocking action a lot stiffer as well, I reckon I just need to fettle the face of the hand a tad more.  What do you guy's reckon?  Prior to the spring breaking the action was perfect so assume the hand is the problem.
Could someone give me a description of what the face of the hand should look like?  The old one went to a point -  angled from the left hand - side.  Hope that made sense.
Thanks fella's

[Sundance]

Better description of problem;
indexs fine sometimes then hand doesn't seem to want to take the cylinder around to the next cylinder - nearly does though.  Hope I haven't taken too much off the hand?  Luckily got a spare if this is the case...
Wondering with wear it will settle down and to leave it..

[rifle]

What type Colt? Brand? Model? Cap&Ball?  Try the new spare and see what happens so you might assertain if you took too much off that one. If the cylinder doesn't rotate enough to index the hand may be too short. The hand usually is flat topped and the curve coming from the bottom up in the front kinda forms a point. The new hands usually are shaped the way they should be so look at the new one.If the old one worked fine until the spring broke that tells ya it's shape must have been good. Did you change out the whole hand and spring assembly or just stick a new spring in the old one?

[Sundance]

Prior to stripping it again sat down and rotated the cylinder for a few minutes on half cock, tried it again and seems PERFECT EVERYTIME so consider it FIXED...........AHHhhhhhhhhhhh successssssss.
Many thanks guy's for your wisdom.