As for the MOF31, because of it's age I doubt if there would be enough of them still around to justify producing one. I would suggest that you contact Elu and ask if the MOF31 chuck is the same as the current or a least recent models.
Hi Jack and Harry
Elu ceased to exist in 1999 because the firm had been taken over by deWalt in about 1989 or so. The MOF31 ceased production in about 1984 when it was replaced by the MOF131, prior to the DW take-over. The MOF131 looks very similar to a MOF177e (or DW625). The original
MOF31 was designed to be used with cutters which had an internal M12 x 1 metric thread and as such they have NO collet or collet nut at all
. Many machines out there have after market collet holders (not DW or Elu ones) - to my knowledge the last firm making these is KWO (Germany), or at least it was 2 to 3 years back.
and all the sites use the same exploded diagram that does NOT show or mention the chuck. My idea was to get the part number for the MOF31
So now you both know why. No chuck part number because there was no chuck
Because of the arbor end is threaded it should be possible to get an engineering shop to make-up an adaptor for use with a Muscle Chuck and a MOF31, however
, any MOF31 is at least 30 years old and most are much older (manufacture started in the early 1960s, I believe, but they were certainly being imported into the UK by Trend in 1965) and they are also pretty low power (1200 watts or just over 1-1/2 "real" HP) so I'd have to ask if it were really worth the effort.
A cheaper approach might be to get hold of an engineering-type ER-20 collet extender and wrench, such as this one
and have it shortened, end bored and threaded by an engineering shop and checked for balance - that way you get a high quality collet holder and extension in one although you'd still need to buy the appropriate ER-20 collets
(sorry for the eBay UK references but they are only meant to illustrate my points)
Incidentally I still have three of them, in working order, although now pretty much retired. Parts availability is, however, zero. And has been for 20 years