9 replies to this topic

[chalywong]

I'm looking for a reliable plungerhead replacement for the crossbow. Wrapping e-tape around the original just isn't that great. I want a sturdy seal that I don't have to worry about all the time. Any suggestions/ideas?

[trogdor65]

In this thread blister says that he replaced the plungerhead with PVC and an O ring.

*click*

Or you could try looking at some homemades plungerheads such as the snap for ideas.

[Salmon]

I have a solution, but first I need to know: is the plunger head still on the gun, and you just want to get a better seal? Or is the plunger head damaged, ripped, shrivelled, or where you couldn't put it back on?

[chalywong]

Everything is stock on it cept e-tape wrapped around the head for a better seal.

[keef]

Try using something like CS/ Cartoon used for their longshots.

A 5/8" metal washer and some rubber washers for the seal.

[Salmon]

Ok, here's what you do:

1. Remove the e-tape(if possible. I highly recommend it)
2. Take a BBB arrow(any Nerf arrow might work too, I don't know) and cut a segment from it about 1/3" thick, or as deep as your the hole in the crossbow plunger head, so you have a little foam disk.
3. Poke a hole in the center of the foam disk.
4. Put the foam disk into the plunger head, so the foam is level with the rim. In other words, so there is no empty space in the crossbows o-ring/plunger head/rubber thing(except for the hole in the middle where it goes on to the plunger rod). You can hot glue it in, if you want.
5. Replace the plunger head and put the gun back together, and you should have a MUCH better seal.

I hope that helps. I will draw up a pic if you need it. I hope this was clear.

EDIT: I don't think you should hot glue it in, on second thought. I didn't, and it has a great seal anyways. You don't want a way-too-tight seal, just nicely snug. When I used those rubber washers that Keef is mentioning, for instance, it actually had TOO good of a seal and only shot like 60-ish feet, and my xbow has 2 BBB springs in it and usually gets 90-110 feet, so I wouldn't recommend it unless you sand the washers down first.

Edited by Salmon, 08 August 2008 - 09:32 PM.

[chalywong]

Sounds awesome salmon I'll def try that out. Keef, your idea sounds good too but its very hard to find those rubber washers.

[mystefansdontflystraight]

When I got my xbow, the plunger head was shrivelled up like an old prune. This is what I did.
First off, I took a piece of 1/2 inch FBR that was long enough to fit in the groove in the plunger head, the part that usually shrivelles inwards. I then cut this foam lengthwise in half, and hot glued it into the groove. I then wrapped enough etape around the plunger head to aquire the seal I desired, and I lubed it like crazy with silicone lube. It used to shoot about 30ft. Now it shoots 90. Im happy.

[ScruffyLookingNerfHerder]

I've been wondering about this. My crossbow makes a loud bang noise when it fires. like it's hittin up against something inside. When I opened it, I realized there is no where near a nice fit inside the plunger tube. Is this thing just really this loose? is it a tapered I.D.? what fix have you guys come up with?