Hello, I'm new to this board but not new to the sport of airguns. My Tarantula XL spring bought the farm this week, I think from detonation (I shouldn't of oiled the chamber). I thought a synthetic oil like RWS chamber lube would not diesel or cause detonation, I was wrong. I've herd that synthetic seals do not require this periodic maintenance but thought it would not harm anything. Anyways my spring broke and I'm going to try JM's E3650 spring with the Apex small seal I purchased back when I got the Tarantula XL spring. Gen or Charlie how would this compare with the Tarantula spring in power. Everything will be polished(spacer bearing surfaces, spring,cylinder,and tophat) and lubed were required. I will be adding at least one .100" spacer on the factory guide rod. The rifle should shoot a little tamer than with the Tarantula XL and shrink tube guide of my previous set up. I'm just concerned about the power, were as before I was able to reach out to 70yds with good accuracy on targeted pests with authority. I've got about .400" of possible spacing that can be added before coil bind. Has anyone crony-ed a Quest/B19 with this E3650 spring and seal tune?