I have used the same sluice (I think that's the right part, not the part that gets sucked into the dome) for literally hundreds of hours and I use a balloon for the other piece, which I have to replace periodically. I also use an astroglide type lube instead of the gel. I think with the parts shipped on the original order, you should be taken care of for a long time. The only thing I would recommend is getting various size sluices and using the one that fits best. I use the [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words] base and rods but for the final rod (the one that connects into the PM end) I use a rod from the old Fastsize kit, their rods happen to be the same diameter as the PM and their threads match the [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words] rods. Also, forget the suction ball and get the tube, I never had any luck with the suction ball but the tube makes putting the device on effortless and it takes less than a minute. After the learning curve, you'll be able to attach the device in no time and wear it for hours on end, I sleep with a leg
strap most nights and have never had any problems. When you wear it for long periods, you get an engorged white colored head but that always fades completely in a couple hours tops. I have never had any injuries from this device, it's fantastic as far as [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extenders[/words] go. Good luck.