<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Rose Brand sells just such an item but very expensive. https://www.rosebrand.com/product3896/Pneumatic-Lift-Triple-Swivel-Caster.aspx?tid=2&info=air%2bcaster<br><div>Our first round of air lift casters were octagonal boxes made out of 2x6 framing with some surplus 1.25” plywood sandwiching small wagon type inner tubes. They worked but were large and clunky. We waxed the moving parts to keep them from binding and used triple swivel casters. </div><div>I found any time you are lifting like this, triple swivels work the best otherwise you tend to side load a standard single swivel. </div><div>Our next set used FABCO pancake cylinders to push the triple swivels down. Eventually we used spring return cylinders eliminating duplicate air lines to retract the casters. </div><div><br></div><div>I had stumbled onto a pneumatic locking caster being sold by Spoon Group a number of years ago at USITT. I was able to reverse engineer them and make my own for about 1/2 the price. They are based on the 4” Cartmaster Caster sold by Rose Brand.</div><div><div style="display: block;"><div style="-webkit-user-select: all; -webkit-user-drag: element; display: inline-block;" class="apple-rich-link" draggable="true" role="link" data-url="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster"><a style="border-radius:10px;font-family:-apple-system, Helvetica, Arial, sans-serif;display:block;-webkit-user-select:none;width:300px;user-select:none;-webkit-user-modify:read-only;user-modify:read-only;overflow:hidden;text-decoration:none;" class="lp-rich-link" rel="nofollow" href="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster" dir="ltr" role="button" draggable="false" width="300"><table style="table-layout:fixed;border-collapse:collapse;width:300px;background-color:#E5E6E9;font-family:-apple-system, Helvetica, Arial, sans-serif;" class="lp-rich-link-emailBaseTable" cellpadding="0" cellspacing="0" border="0" width="300"><tbody><tr><td vertical-align="center"><table bgcolor="#E5E6E9" cellpadding="0" cellspacing="0" width="300" style="font-family:-apple-system, Helvetica, Arial, sans-serif;table-layout:fixed;background-color:rgba(229, 230, 233, 1);" class="lp-rich-link-captionBar"><tbody><tr><td style="padding:8px 0px 8px 0px;" class="lp-rich-link-captionBar-textStackItem"><div style="max-width:100%;margin:0px 16px 0px 16px;overflow:hidden;" class="lp-rich-link-captionBar-textStack"><div style="word-wrap:break-word;font-weight:500;font-size:12px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-topCaption-leading"><a rel="nofollow" href="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster" style="text-decoration: none" draggable="false"><font color="#272727" style="color: rgba(0, 0, 0, 0.847059);">4" Cartmaster Caster from Rose Brand</font></a></div><div style="word-wrap:break-word;font-weight:400;font-size:11px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-bottomCaption-leading"><a rel="nofollow" href="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster" style="text-decoration: none" draggable="false"><font color="#808080" style="color: rgba(0, 0, 0, 0.498039);">rosebrand.com</font></a></div></div></td><td style="padding:6px 12px 6px 0px;" class="lp-rich-link-captionBar-rightIconItem" width="36"><a rel="nofollow" href="https://www.rosebrand.com/product2877/4-Cartmaster-Caster.aspx?tid=2&info=caster" draggable="false"><img style="pointer-events:none !important;display:inline-block;width:36px;height:36px;border-radius:3px;" width="36" height="36" draggable="false" class="lp-rich-link-captionBar-rightIcon" alt="apple-icon.png" src="cid:EC276263-AFC3-4327-8865-E36613E116DE"></a></td></tr></tbody></table></td></tr></tbody></table></a></div></div><div style="display: block;">We CNC’ed the fitting to hold the caster and include a low profile pancake cylinder. They work very well on smaller scenery. </div><div style="display: block;"><br></div><div style="display: block;">I have never seen the Spoon Group caster for sale again (thus the reverse engineering) I did find the patent for them and have considered reaching out and seeing if they are for sale anywhere. I feel every theater should have a dozen in their stock as useful as they are. </div></div><div><img alt="PastedGraphic-1.tiff" src="cid:EABD32E9-C077-4F46-8788-FEAFE7F72309"><br><br><br><div><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>Greg Bierly</div><div><br></div><div><br></div></div></div><blockquote type="cite"><div>On Aug 5, 2024, at 5:01 PM, Jon Ares via Stagecraft <stagecraft@theatrical.net> wrote:</div><div><div>Has anyone tried building a system using something like these,<br>commonly available today?<br>https://www.amazon.com/IMPROVED-Commercial-Professional-Alignment-Inflatable/dp/B09F34QGB6/</div></div></blockquote></div><div><br></div><div><br></div></body></html>