Repair Of Lip Crack - Onoto 6000 Bchr

[Conradandhispens]

I have just bought two onotos, one is a 6234 plunger, and another is a very early BCHR pen. The BCHR is in great condition, except for the cap having a small lip crack (its a slip cap by the way) Im wondering how I can fix this? I am not sending the pen overseas to a repair man as Im confident I can do the repair, I just don't know how. Or if it cant be repaired Id buy a cap off of someone. Here's some pics.

thank you.

[praxim]

Even though a slip cap is not under much pressure, it is usually enough to open an attempted glue repair. Part of the problem is how small is the surface available for glue, the cap being very fine there, quite apart from the difficulty of gluing hard rubber and the stresses in that position.

 

I have repaired a 3000 where after gluing, I put a couple of O-rings around the cap to provide some constant tension against any spreading effect. This seems to have been successful but is better suited to a workshop pen. The last time I looked the cap seemed tight without the O-rings but I am not betting on its longevity without them.

 

You could be successful with Loctite 480 if you also swage a ring firmly into the slot where it is missing.

[Conradandhispens]

Even though a slip cap is not under much pressure, it is usually enough to open an attempted glue repair. Part of the problem is how small is the surface available for glue, the cap being very fine there, quite apart from the difficulty of gluing hard rubber and the stresses in that position.

 

I have repaired a 3000 where after gluing, I put a couple of O-rings around the cap to provide some constant tension against any spreading effect. This seems to have been successful but is better suited to a workshop pen. The last time I looked the cap seemed tight without the O-rings but I am not betting on its longevity without them.

 

You could be successful with Loctite 480 if you also swage a ring firmly into the slot where it is missing.

thanks for the advice. for the meantime while I wait to do a repair should I drill a tiny wee hole in the end of the crack?

[praxim]

thanks for the advice. for the meantime while I wait to do a repair should I drill a tiny wee hole in the end of the crack?

I would not, assuming it will be lying around waiting for repair. Separate the cap from the pen in your per-pen repair container. It will be happy as a pig in processed food waste.

[Conradandhispens]

I would not, assuming it will be lying around waiting for repair. Separate the cap from the pen in your per-pen repair container. It will be happy as a pig in processed food waste.

Yeah your right. Im thinking getting a new cap for this pen will be expensive... Ill wait to see if anyone here has one I could buy. Dont know if any repair can hold up to use.