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Motor retainers
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You need a system to retain your motor in it's mount. Some motor mount kits will include this, however some won't and if you're making your own from some motor tube you will need to ensure the motor doesn't escape (either way).
A thrust ring at the front of your motor tube, and a retaining system at the rear should work great.
You can choose engine hooks that hold the motor in place, or motor retainers that screw into place. 
You can even make a 29mm mount and use adapters to have the option of using both 24 and 29mm motors too, although this will add some weight. 

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24
24mm motor retainer set - Estes
D-ES9751
Stock: 20 item(s)
39.78 PLN 33.14 PLN
+ −
18mm thrust ring, 6 pieces
8054
Stock: 15 item(s)
16.52 PLN 13.78 PLN
+ −
Engine mounting brackets, 6 pieces - 68mm - AD
8055
Stock: 13 item(s)
16.52 PLN 13.78 PLN
+ −
24mm thrust ring, pack of 3, 23.8mm OD / 18.6mm ID
502424011
Stock: 17 item(s)
13.58 PLN 11.30 PLN
+ −
18mm Engine retainer set (3 pack) Estes
D-ES3187
Stock: 3 item(s)
32.93 PLN 27.46 PLN
+ −
24mm Aluminium Motor Retainer
BCR-RETAINER-24
Stock: 6 item(s)
90.80 PLN 75.65 PLN
+ −
95mm heavy duty engine hooks (4mm x 0.9mm profile) - Pack of 3
MRS-HOOK-95x3
Stock: 9 item(s)
40.48 PLN 33.75 PLN
+ −
29mm Aluminium motor retainers anodised red Blackcat rocketry
BCR-AMR-29
Stock: 2 item(s)
112.69 PLN 93.89 PLN
+ −
Engine hook accessory pack Estes - Mini, Regular, D and E size motors
D-ES3143
Out of stock, contact us.
24.27 PLN 20.22 PLN
Z CLIP MOTOR RETAINER SET
MR-1
Out of stock, contact us.
49.45 PLN 41.19 PLN
29mm HAMR Retainer SET - Motor retainer for 29mm motors
HAMR-29-SET
Out of stock, contact us.
212.25 PLN 176.88 PLN
29mm LOC Pro motor retainer machined aluminium
LOCPROMR29
Out of stock, contact us.
180.84 PLN 150.69 PLN
29mm Standard retrofit aluminium motor retainer Blackcat rocketry
BCR-SMR-29
Out of stock, contact us.
64.75 PLN 53.96 PLN
29mm Motor retainer set Estes
D-ES9750
Out of stock, contact us.
40.43 PLN 33.69 PLN
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