I have a pneumatic cylinder with a stripped fitting, which causes a slow leak. I took it to a machine shop and he tried to re-thread it but there wasn't enough good metal left to get a good thread. He told me there wasn't enough room for an oversize fitting and suggested I try liquid thread sealant.

Unfortunately, this hasn't worked. There is still a slow leak.

This is for a DIY RV loft type bed that uses 4 pneumatic cylinders to lift the bed up toward the ceiling, which will never need to support more than about 25 LBS or so - just the weight of the bed.

I'm thinking I should maybe try Blue Block or epoxy, but hoping to get some advice first.

Much thanks...Jon

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    $\begingroup$ Weld another boss on it - but would that still meet safety regs? Get another cylinder and don’t overtighten that one... $\endgroup$ – Solar Mike Apr 4 '20 at 6:31
  • $\begingroup$ Hey thanks - yeah that's probably good advice. No safety regs involved here. It was a used cylinder. I didn't strip it in the first place :). $\endgroup$ – Jon Vote Apr 4 '20 at 17:20
  • $\begingroup$ @JonVote, the standard "cheap bast*rd" fix in such a case is silicone RTV caulk. it fills gaps and holds pressure well. glob up the threads with this and screw the fitments together! $\endgroup$ – niels nielsen Apr 5 '20 at 0:48
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    $\begingroup$ You could JBWeld it together if it never needs to come apart again. But cutting it off and adding a new one would be the standard solution. $\endgroup$ – Tiger Guy Apr 5 '20 at 21:40
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    $\begingroup$ Just a followup - I followed the suggestion from @Tiger Guy and this has worked --- at least so far. Again - this is a non-critical application. Nothing bad will happen if the fix fails. Thanks to all who answered. $\endgroup$ – Jon Vote Apr 21 '20 at 21:46

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