Watch Repair Tools · Buying guide

Choose Crystal Tools, Closing Presses and Die Interfaces

Separate closing an external back from removing a crystal, then compare the working contact, supplied dies and actual receiving connection.

The operation comes before the largest number on a die
Example or format	Useful choice	Check before choosing
JOREST Round Snap-Back Case-Closing Press	Round snap-style closing; eight two-faced dies	Seller specifies round dials 22–42 mm; 50 mm is a die-face label.
Ejoyous Screw-Driven Press with Twenty Shaped Dies	Twenty physical dies with round, square and shield profiles	M6 upper/lower receivers are the seller’s claim, not universal attachment fit.
JuxLux Eight-Piece Shaped Watch-Press Die Set	Accessory contacts for an existing desktop press	Plastic bodies/copper inserts; exact thread and compatible models are not given.
hengfento2 Seven-Piece Metal Press Die Set	Seven metal contacts with separate inner/outer labels	Lists 316L and 5500A/5500C; exact dimension pairing and adapters need checking.
Keenso Watch Crystal Removal Air-Pump Tool	Pressure-removal tool for a one-piece case	Four spare nozzles are additional to the nozzle shown fitted; pressure limits are not specified.
Bergeon 4266 Crystal Lift	Gripping/compression crystal lift, 10–45 mm	Seller restricts it to an “unbreakable” crystal without a tension ring.

Start with what must move

A case-closing press, a crystal lift and a crystal-removal pump address different contacts. JOREST and Ejoyous are closing-press choices. The Bergeon 4266 grips or compresses a suitable crystal, while Keenso describes pressure removal from a one-piece case. A similar bench-tool shape does not make one a substitute for the other.

Before comparing assortments, identify the watch’s construction and the operation required by its maker. For closing a snap-style back, compare the support under the watch and the contact on the back. For crystal work, establish the crystal and case construction first; the 4266’s range does not establish suitability for mineral or sapphire crystals, and the pump’s nozzle assortment is not a universal case-fit list.

Choose the complete press by its actual scope

JOREST explicitly specifies round dials 22–42 mm and excludes square or oval shapes, out-of-range watches, screwed backs and multi-groove screw-back arrangements. It supplies eight dies, each with two labeled faces, plus protective film and English instructions. Choose it for that stated application rather than for the largest 50 mm face label.

Ejoyous offers twenty physical dies with round, square and shield profiles, plus a screw-driven frame. The seller describes a face-down arrangement that leaves the back visible during closing. Its approximate 12 × 10 × 20 cm size is useful for bench planning; it is not stroke or usable clearance. The shaped assortment gives more contact formats to compare, without establishing fit for every square or shield-shaped watch.

Buying loose dies is an interface purchase

JuxLux is the narrower purchase if you already own an appropriate desktop press and need shaped contacts. Its eight dies have plastic bodies and copper threaded inserts; the seller excludes handheld press pliers. Get the actual thread diameter, pitch and seating geometry before pairing it with a machine. Ejoyous’s M6 specification must not be assigned to JuxLux by association.

The hengfento2 set is a metal-contact option, listed as 316L stainless steel. Its outside labels 27–39.5 mm and inside list 19–31 mm are not supplied as explicit pairs, and die 2 separately carries a 21.68 mm inside label. Ask for the exact inner and outer dimensions of the selected contact. Two threaded pieces are pictured without a separate adapter allocation, so verify what connects the set to your press instead of assuming a complete nine-piece package.

Compare the two crystal-removal approaches conditionally

The 4266 is the relevant comparison when the crystal matches its “unbreakable, without tension ring” restriction and 10–45 mm range. Its gripping/compression format is the important difference from a pump. A platform is pictured but not separately itemized; confirm it if the intended setup depends on it.

Keenso describes a pump for crystal removal from a one-piece case and lists four spare nozzles and one pry piece. The fitted nozzle is not one of the four spares. Exact nozzle dimensions and pressure limits are not supplied, so this is a conditional alternative for the required construction, not an interchangeable way to use the 4266’s size range. Neither tool is a water-resistance tester.

Keep closing and verification separate

A useful purchase checklist has three separate entries: the part of the watch being worked on, the contact that bears on it, and the receiver that connects the attachment to the tool. A model label such as 5500A/5500C or an M6 thread claim answers only part of that checklist. An accessory is a related component, not a complete press.

Use the exact watch and tool instructions for centering, fastening and clearance. JOREST specifically includes assembly and glass-clearance guidance. No listed closing press provides a calibrated force setting or proves water resistance after the back is closed; keep any required verification as a separate service requirement.

Questions before you choose

How do I check a press and die set against my watch?

Compare the actual closure and contact surfaces, not just a diameter. JOREST’s 22–42 mm is its seller-stated round-dial scope; its 50 mm label belongs to a die face. On a loose die, also confirm the receiver, bearing profile and any adapter.

Can I add these loose dies to a press I already own?

Only after checking the real connection. JuxLux does not give an exact thread specification; hengfento2 names a system but leaves exact receiver/adapter fit unconfirmed. Ejoyous’s M6 upper/lower receiver claim does not establish either set’s fit.

When should I compare the pump with the crystal lift?

When choosing a removal method for a specifically identified case and crystal. Keenso describes a one-piece-case pressure-removal role. The 4266 has a gripping/compression role restricted to an unbreakable crystal without a tension ring. Establish which construction applies before comparing them as alternatives.