It's true that when I first got the SPD3303X-E, I thought the binding posts worked OK but after using it for several weeks, I found that certain banana plugs would drop out of the binding posts with the slightest movement of the cable, I also discovered that, if you use a spade connector, the binding post becomes almost unusable - the plugs won't grip at all. The link Tautech has given is indeed my suggested, tried, and tested way to allow you to use what are clearly inferior banana plugs with the SPD3303X-E because the binding posts fitted to it cannot be improved upon because they are in fact, awsomely superb, expensive etc and Siglent is infallible. This is the gospel according to Tautech.
C'mon Tautech, I haven't provided the data for that thread yet but I beseech you, in the bowels of Christ, think it possible you may be mistaken that there's no room for improvement regarding the choice of binding posts for the SPD3303X-E, I wasn't even the one who raised "the binding post issue" in the first place, others have made the observation prior to me.
Peace man and thanks for the help on de-bricking.