One part on my trusty Pista pump finally gave up the ghost.

It's the top cap or neck on top of the cylinder where the pump piston goes through. Here's a pic:

Untitled by tk_1971, on Flickr

Any ideas where I can get a replacement for this? If nothing else, I'll have to have someone machine me one.

I can't really tell how bad it is, if not too bad there is this stuff like J-B Weld 8237 PlasticWeld Plastic Repair Epoxy Putty. If the cap take hits it probably would not last but if it just guides the pump shaft maybe. I think a craig's list or ebay for a used pump might be a lot cheaper than machine work unless you have connections with machinists.

Silca is still in business and may be able to provide replacement parts for the older pumps. Here is the contact info: https://silca.cc/pages/contact-us

However, Silca is under new ownership and has gone WAY upscale so don't be surprised if the part is quite expensive if available.

Yellow Jersey in Madison WI has been around for a long time... ask there.. online.

plastic , maybe 3D Print a replacement..

Silca stated they don't make these anymore and I can't seem to find them anywhere.

Anyways, I was looking through my scrap and found a poly rod that roughly matched the ID of the pump body.

After some cutting and some time on the drill press, I ended up with this:

Untitled by tk_1971, on Flickr

In order to make the stop on the top of the cap, I figure I'd melt the top and mushroom it on my counter top. I tried using my stove:

Untitled by tk_1971, on Flickr

It was going way too slow. I then pulled out my MAP torch and made quick work of it:

Untitled by tk_1971, on Flickr

The trick is to apply even pressure when mushrooming the top of the cap:

Untitled by tk_1971, on Flickr

Re-drilled the 10.3mm hole (13/32") on the top cap (because of all the mushrooming), measure, and cut to size:

Untitled by tk_1971, on Flickr

Untitled by tk_1971, on Flickr

Put the cap in place, drill the side holes, and finished!!!

Untitled by tk_1971, on Flickr

I put a small dimple on the top to indicate where the hole is at for future maintenance use (for alignment).

That is incredible! Very nice work and very creative with your solution.

Very nice fix. Given the two side screws, I wonder if the "mushroom cap" on top is really needed.

Excellent work Mr. tk1971!

moral of story... dont pull the pump handle up , causing that broken part.