149 Cap Threads Change - When?

[FredRydr]

What is the date or year of Montblanc's change in the cap threads of the resin 149?

 

Fred

[zaddick]

I think 1995 or so they changed the number of starts from 4 to 3. I seem to recall Tom W. highlighting this before.

Edited April 26, 2016 by zaddick

[fountainbel]

I think 1995 or so they changed the number of starts from 4 to 3. I seem to recall Tom W. highlighting this before.

Any idea why MB changed to 3 leads threads?

Only potential benefit I can see is the fact the cap - applying the same closing torque - will close more securely due to the smaller lead angle of the threads.

Only potential drawback being its takes more rotation to screw the cap on….

[FredRydr]

Could it be more cost effective? I don't see how.

 

I ask because of the need to know when sourcing used parts. It's hard enough already to identify which parts are compatible with a particular pen. I had guessed 1996, so I was close! :-)

 

Fred

Edited April 26, 2016 by FredRydr

[Barry Gabay]

In the past couple of months, I have come across two 149s with reconditioned barrels (new barrel, mechanism, & feed) and 1970s nibs. Both pens had pre-1982/83 caps. They were the old-style with "nipple" cap crown. Surprisingly, these fit the new barrels perfectly. Is it possible that the caps' threads were re-cut to fit the new barrels?

[FredRydr]

Is it possible that the caps' threads were re-cut to fit the new barrels?

 

I would think Montblanc keeps both type barrels in inventory for repairs. It should be less expensive than replacing both barrel and cap when only one is damaged or defective. (Disclaimer: Fred's experience running an international pen manufacturing corporation is rather limited: nil.)

 

Fred

Edited April 29, 2016 by FredRydr