Injecting - problem with removing a tourniqet

[sterckxke]

when i schoot some dope,i applie the tourniquet,insert the needle and register.everything is perfect.But then i remove the tourniquet(while i leave the needle in the same place.) and then i see if i'm still in the vein by registering angain,But i'm not,the needles slips out of the vein every time,have you ever had this problem?how did you solve it?

Thanx