How to Keep Rubber Eyepiece on HB Prism PM-5

[bags27]

I've already lost the original and paid through the nose for a replacement, which has now fallen off twice (luckily, I've spotted it). I'm thinking of using rubber cement but first want to check if anyone has a better idea. Thanks!

 

[BrianShaw]

For me the answer to that problem was to develop a neurotic habit of continually checking it for tightness. Rubber cement, though, seems very reasonable.

 

[eli griggs]

I believe I have two 45⁰ prism eyecups in my kit, and I've thought about making a reusable mold of one, so I don't have to hunt one up in an increasingly smaller market presence, just make my own.

I've already considered using a well fitting "O" ring, glued to that section on the eyepiece that will position or 'lock' the rubber section to the prism groove and more secularly give it a mount.

Since a flat on each side of the "O" ring will allow a better fit, I suppose I can always wet mount a wet/dry abrasive sheet to a piece of plate glass, by using a "necklace" of appropriate super glue dots around one side of O ring and mount it to a piece of tile or plate glass, for abrading the far side into a flatter geometry ( the necklace glue application will be a more durable fixture than a continuous ring of glue will be and not leave a hard and brittle ring to deal with latter.

Once the flat is worn into the "O" ring on one side, take a second tile or plate glass block and, after making a second necklace of glue dots on the flattened side and affix it to the ring.

With the first flat side is in place, on the bottom of the two plates, use a syringe, piplet, or very thin horsehair brush or wool yarn to move or brush super glue solvent on the lower side to release it from the original tile or glass plate.

When washed and dried the still rounded side that is now exposed, is also given the same treatment the first flat required.

Remove from block when done and wash and dry the rubber or silicon ring one last time.

Once you've positioned the ring on the eyepiece, make one more necklace of glue dots inside the mounting groove and drop the flat edge of either side of the ring into the ready groove, for a snug fit to the prism.

 

[Sirius Glass]

I tried super glue holding the eye cup with camera. That was too stiff and it did not work well for me. I thhe ey en used Pliobond 25 and that has worked well in holding the eye cup on the camera and being flexible enough to work well.

 

[eli griggs]

Yes, super glue should be applied in dots so the eye piece remains more flexible, and less hard than a solid ring that has no flex.

Pliobond 25 seems to be "The go too" adhesive for most all camera related repairs in reskining a a body or lens and I have no idea why I don't have any yet.