JMI Replacement Standard Leveling Screws — Universal Style Wheeley Bars

Product Overview

These are factory-spec replacement leveling screws for a JMI Universal-style Wheeley Bar, supplied three to a set — one per leg, the bar’s full complement. Each screw measures 10″ overall and carries the same knurled knob and threaded shaft as the screws JMI installs at the factory. Two thread diameters are offered: 5/8″ for the current HD bars and 1/2″ for Standard Medium and earlier HD model years. Made in the USA by JMI, part of the CXB Astro family.

Who It's For

This is a good match if you run a Universal-style Wheeley Bar and have lost a leveling screw in transport, bent one on a curb or a rock, or would like a complete spare set in the gear case before a run to a remote site. It also suits you if the three screws on your bar have aged out together and you would rather change all of them at once than chase them one at a time.

Key Features & Design

• Factory-spec parts: the same 10″ length, knurled knob and threaded shaft JMI fits to current production bars.
• Three to a set: a Universal-style bar levels on three screws, one per leg, so one set covers the whole bar.
• Two thread diameters: 5/8″ for current HD Medium, HD Large and HD Shorty; 1/2″ for Standard Medium and older HD Medium / HD Large.
• Hand-turned adjustment: the knurled knob levels the bar at setup without a tool.
• Set weight: 2 lb for the set of three, in either diameter.
• Made in the USA by JMI, part of the CXB Astro family.

Recommended Uses

• Replacing a single screw lost or bent between the driveway and the observing pad.
• Carrying a full spare set of three to a star party or remote site, where a failed screw otherwise ends the session.
• Refreshing all three legs at once so the leveling feel stays consistent across the bar.
• Restocking a club or shared-equipment bar that several people set up and tear down.

Compatibility and Accessory Notes

• 5/8″ version (TPWLLS-5/8-R): JMI Universal-style bars currently running 5/8″ screws — HD Medium, HD Large and HD Shorty.
• 1/2″ version (TPWLLS-1/2-R): JMI Universal-style bars currently running 1/2″ screws — Standard Medium and earlier HD Medium / HD Large model years.
• The two diameters are not interchangeable. The bar’s threaded mount points are sized for one or the other, and pulling a single screw and measuring its thread settles which set applies.
• Triangle Style Wheeley Bars mount their leveling screws differently and take the Triangle Style Leveling Screws and Hardware Upgrade kit instead. Sky Trekker models fall outside this fitment.

Tell us which Wheeley Bar you own and we’ll check the screw size and the fit for you.

Good to Know Before You Order

• These are replacements rather than an upgrade. A set of 5/8″ screws does not convert a 1/2″ bar; the frame’s threaded mount points are sized for one diameter, and changing that is factory work rather than a field job. CXB Astro can say whether a particular bar is a retrofit candidate.
• The size is read off the bar, not the model name. Model years overlap, so the thread diameter of the screw already in the bar is the reliable guide.
• Mixing old and new screws works as long as all three share a diameter. Changing all three together keeps the leveling feel even from leg to leg.
• One set covers one bar. Two bars take two sets.
• The set weighs 2 lb. Shipping is by weight, so a spare set adds little to an order already carrying a bar or an accessory.

Frequently Asked Questions

Is it difficult to install?

No. The screws thread into the bar’s existing mount points by hand — the old screw comes out, the new one goes in, and there is no drilling or tooling involved. Changing all three takes a couple of minutes.

How do I tell whether my bar uses 1/2″ or 5/8″ screws?

Pulling one screw and measuring the thread diameter with calipers or a ruler answers it directly. 5/8″ is the current HD standard; 1/2″ is the older one, on Standard Medium and earlier HD bars. A photo of the bar sent to us works as well.

Can the 5/8″ set upgrade a 1/2″ bar?

No — these are direct replacements. The mount points on the frame are threaded for one diameter, so a larger screw has nothing to thread into.

Do all three need changing at the same time?

No. Old and new screws mix freely at the same diameter. Many observers still change all three together so the three legs behave the same way.

Does this set fit a Triangle Style bar?

No. The Triangle Style frame mounts its leveling screws differently and takes the Triangle Style Leveling Screws and Hardware Upgrade kit, which supplies the screws together with the mounting hardware.

Bottom Line

In short: a USA-made set of three factory-spec 10″ leveling screws for JMI Universal-style Wheeley Bars, in the diameter the bar already uses — 5/8″ for current HD bars, 1/2″ for Standard Medium and older HD. Two pounds to the set, and a direct swap by hand.