Short answer: the ones that are too tight you can either clip onto something wide for a couple days, or dismantle it and manually bend the spring open slightly to reduce its tension (may take practice)



Long answer:

I've bought them in lots of 100 and found that the spring tension varies greatly from pin to pin. I go through them individually for a couple of reasons.

1. I paint most of them (I like colors).
2. I check for ones that might need a little sanding or might splinter (i dont repair these, they find a home in the garbage).
3. some I dip the tips into tool dip for a rubberized bite.

In the process of this, I sort them into 3 piles.

Light (the ones that dont grip well without a rubberband or some other stiffening agent.

Normal (the majority of them)

Heavy (the ones I pry apart and bend the spring open a little on)