hi you could do what i do on all my qb tunes and tha is thake the washer that goes under the spring and solder it on to an empty 12gram capsual drill it out to the same size as the pin then cut the cap of at about 10mm fie 3or4 u shapes out of the washer then fit it in with the 10mm end at the bottom this centers the pin as i have had 1or2 stick before and if you do this it will never stick again prob solved good luck Graham