The 2 primary culprits and variables with push pin sound
1--peg
2-sound board
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Moisture and extreeme temperature will change a pushpins sound board and peg ....heating up the wood and "moving "the resin inside those two parts ..and changing the tone.
I only use and provide Primos chalk when i sell a call --I recomend you try it too...chalk is a BIG DEAL with push pins .....if your having trouble with a push pin ....take that whatever chalk off(wipe-light steel wool) and get some brown primos chalk and pUT it on
Many of the large maker designs use.a fail proof peg design ....no tuning oaky...that's why if you pick up 20 of them.only a certain few sound okay ...the rest are duds
I could talk for hours about push pin pegs ...there is so much that can go wrong
It's the peg....I have a wooden primos I should see if I can mess with the peg and see if I can hot rod it ,, of I have luck with it it's possible I could tune others like it