QUOTE(thepenladyuk @ Jan 9 2008, 07:08 PM) [snapback]473227[/snapback]
QUOTE(Paddler @ Jan 9 2008, 03:36 PM) [snapback]472757[/snapback]
I have one of those! It is green/black/gray cracked ice.
The section screws into the barrel with a standard right-hand thread. Mine was not shellacked in place. I could just unscrew it and have a look at the sac. If yours is hardened, you can replace it with a No. 16 cut to 2 1/4".
Sorry, I don't know any penmeisters in the UK.
This is a really nice little pen. It writes very well.
Paddler
Oh yes, it was a bit stiff but did unscrew - whew! - and you are right - inside I can see debris in the barrel which I guess is the hardened sac. I don't know how all that would be removed?....plus, I presume a No.16 is a new rubber sac - how does it fix to the nib end? - actually quite interested now in wondering if this is something that I could do myself successfully??
Many thanks.
You have already done the hard part, probably. You just chip the remains of the sac out of the barrel, being careful not to damage the pressure bar under the lever. Sometimes the hardened rubber parts just fall out. Sometimes some of the old rubber sac will adhere to the inside of the barrel and must be chipped free. A small assortment of dental picks or a jeweler's screwdriver can be used.
The remains of the hardened sac must also be scraped from the nipple at the back of the section. Do this carefully so you don't scrape a flat place on the nipple. A flat may cause an ink leak later. A small knife is handy for this. Oddly enough, a rather dull knife sometimes works better than a sharp one for this task.
Sac diameters are measured in 64ths of an inch. A No. 16 sac is 16/64" in diameter. Using kitchen arithmetic, that is 1/4." I don't know where you can obtain sacs in the UK. I get mine from the Pen Sac Company in Carlsbad, California. I think your pen needs a sac 2 1/4" long. You should check the length; Burnham may have made different length barrels for this model. The sac doesn't need to be necked or tapered - use just a straight sac. Buy one too long and then cut it to size. There is no mystery to getting the length right; you just don't want the sac to hit bottom in the barrel and then kink or twist when you insert the section all the way.
You install the new sac by spreading a drop of shellac on the nipple and just a bit of shellac around the mouth of the sac. Then slip the mouth of the sac all the way onto the nipple and let it dry there for a few hours. The diameter of the sac is smaller than the diameter of the nipple. You start one side and then push it all the way on. The sac will stretch. Coat the outside of the sac with powdered talc, and reassemble your pen.
I think Richard Binder's web site has more explicit directions for replacing a sac. If you have never done this repair before, it can help to read two or three different procedures for it until you can visualize everything with your mind's eye. Patience is your friend here. Find links to all this in the pinned topic at the top of Repair Q&A.
Congratulations on getting a very nice pen!
Paddler