The Unofficial P64 Resource Forum

The top one is a pa-63 the bottom one is a stock p-64



remember to cut the small end of spring
there is no scraping of the sides with this fix

a little tough getting the slide back on but it will go on

I got the strongest PA-63 spring that Wolff makes

NORM

Norm,

Can you give me some measurements of the 63's spring so I can put it into my model:

OD of the spring
diameter of the wire
length of the spring sitting uncompressed

Thanks,

Saands

saands

1.36 MM DIA. WIRE (this not right took measurement at end of spring where I had ground flat re took measurement at center of spring) sorry about that

1.39 mm dia wire or 1.40mm dia

16.28 MM LARGE END
15.86 MM SMALL END
77.24 MM TOTAL LENGTH


NORM

Norm ...

Please be careful and start off by shooting something soft! My calcs show that, if the same materials were used, this spring will be considerably lighter than the original. I have been using the energy stored in the spring as the slide retracts as my figure of merit, and this one as you have described it falls about 20% short of the factory spring that the P64 came with. It COULD be made of stronger steel, but I wouldn't expect it to overcome that kind of geometrical disadvantage.

Saands

ps ... that HK spring must be SO close to fitting ... it is barely bigger than the PA63 at the large end ... maybe it rubs more toward the small end of the slide ???

Looking at Norm's photo of the two springs, one has coils
running to the left the other in the opposite direction, both at
a slightly different pitch & recoil has to be changed by these
factors.


::)

saands

1.36 MM DIA. WIRE (this not right took measurement at end of spring where I had ground flat re took measurement at center of spring)

sorry about that

1.39 mm dia wire or 1.40mm dia



NORM

Norm ... that certainly helps ... but even at 1.41" it looks like you will still be a little light with this one. The real difference in my calcs is the free length of the spring ... you are a couple of mm shorter than the factory spring I measured. It is AMAZING how sensitive springs are to slight changes!

I'll be interested to hear how it works ... and I think that I will hold off placing an order for springs until I build a spring rate tester so I can precisely quantify what we have and what we can get ... I should be able to get to that this weekend in the shop.

Saands

Saands

It's the same length as my stock spring maybe a mm longer

this is on my 1969 maybe the stock spring is worn out and the dia. of stock spring on this gun was 1.35 mm



NORM

Norm, looks like by cutting off the extra length of the similar diameter PA-63 spring, you would negate any advantage of the swap. We just need a longer barrel. Think I heard that somewhere before. LOL.
JMHO,
Stan

saands
Just fired 5 rounds with 109 grn lead bullets with 4 grn of
w 231 powder
less recoil
and brass didn't go in next zip code

these are the rounds I carry in all my 9x18 pistols

NORM

Sounds like you have a winner with that recoil spring mod,
You can make me one & I'll pay you.

duggi60
YOU HAVE A PM


NORM

NORMSUTTON

Hey, Norm, will you make one for me too while you are at it?

beasleydano

Let see if duggi60 likes it first

it will take about 2 weeks for him to get it because i just order the spring from Wolff this morning


NORM

Norm,
Don't forget about sending me some pics & price and we'll put your newest item up on the site for sale.