Weihrauch Hw 77 & 97

Hi guys just a quick question does anyone know of how to make a compression tube end cap removal tool ie how to make one by a drawing or description of dimensions. As my compression tube on my hw77 has a leak so not getting power to the pellet has it should be. So want to remove the end cap and reseal it. Has you guys may know you cannot seem to buy the 25mm compression tubes anymore that is why i am looking for anyone which has the know how to make this tool. If anyone can help please leave me a comment or pm me thx.
 
I was thinking of something like this tell me what you think guys would this deign work let me know what you think and if anyone has made one like this, and do you know the precise dimensions to make the tool thx.
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I'm certainly no expert but I saw a Crescent type adjustable wrench handle padded with a leather strap used to unscrew the end cap on an HW55 rebuild. The person placed the padded round end of the handle in the trigger slot and tapped the wrench part with a block of wood to break loose the cap then used the wrench as a handle to finish unscrewing the cap. Of course a spring compressor was used as well. 
th
 
 
Why would you want to take apart the compression tube and for that matter I don't think it does come apart. 
you need to pry the old seal out with a dental pick or something similar and install a new one... it's that easy! 
Or if your talking about the piston seal itself then full disassembly is required from the rear and removing the spring. With a spring compressor or you might hurt yourself!



James from Michigan ,
 
Hi James all new seals rebuilt the rifle due to drop in power I checked the compression tube blocked the transfer port and put it in water and there's a leak coming from the cap. I have been told to epoxy round the the line and create a vacuum to pull it in. I would rather unscrew it and reseal for a better job then you know it is fully sealed. I hope this tells you what I'm after doing thx.